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Conception 101: Key Factors, Timing, and Real-Life Scenarios Explained

Written by healthwords.ai's team of doctors and pharmacists based in UK | Updated: 01 Jul 2025 | 5 min read

Conception is when a sperm cell from a man joins with an egg cell from a woman. This starts the process of pregnancy. Even though it sounds simple, many things need to happen for conception to work. Sometimes, it can take a while, and each person’s experience is different.

For conception to happen, you need:

  • A healthy egg

  • Healthy sperm

  • Good timing

  • The right conditions inside the body

Even when everything seems right, it might still take time to get pregnant. Everyone’s body, health, and lifestyle can make a difference.

Understanding your menstrual cycle and fertility window

Why Know Your Cycle?

Knowing your menstrual cycle helps you figure out the best time to try for a baby. The cycle has different stages, and each one is important for pregnancy.

Phases of the Menstrual Cycle

  • Follicular Phase (Days 1–14): This starts on the first day of your period. Your body gets an egg ready to be released.

  • Ovulation (Around Day 14): The egg leaves the ovary and travels down the fallopian tube. This is the best time for the egg to meet sperm.

  • Luteal Phase (Days 15–28): The body prepares for a possible pregnancy. If the egg isn’t fertilized, your period will start again.

The Fertile Window

The fertile window is the time when you are most likely to get pregnant. It lasts about six days: the five days before ovulation and the day you ovulate. Sperm can live inside the body for up to five days, but the egg only lives for about 12–24 hours after ovulation. Having sex during this window, especially in the two days before ovulation, gives you the best chance to conceive.

How Can You Find Your Fertile Window?

  • Basal Body Temperature (BBT): Take your temperature every morning. A small rise can show ovulation has happened.

  • Ovulation Predictor Kits (OPKs): These test your urine for a hormone that rises before ovulation.

  • Cervical Mucus: Around ovulation, your mucus becomes clear and stretchy, like egg whites.

  • Cycle Tracking Apps: Apps can help you keep track of your cycle and predict ovulation.

What Affects Conception?

Many things can make it easier or harder to get pregnant:

  • Age: Women’s fertility drops after age 30, and men’s sperm quality can drop after age 40.

  • Weight: Being too thin or too heavy can affect hormones and fertility.

  • Smoking and Alcohol: Both can lower the quality of eggs and sperm. Try to quit smoking and minimize alcohol.

  • Diet and Exercise: Eating healthy foods and getting regular exercise helps your body work well. Too much exercise can sometimes cause problems.

  • Sleep: Getting enough sleep helps keep your hormones balanced.

  • Stress: Too much stress can affect hormones and make it harder to get pregnant.

  • Medications: Some medicines can make it harder to conceive. Always check with your doctor.

  • Environment: Chemicals like pesticides and plastics can hurt fertility. Try to avoid them when possible.

  • Health Conditions: Problems like polycystic ovary syndrome (PCOS), endometriosis, diabetes, or thyroid issues can make conception harder. Men can also have issues like low sperm count or problems with sperm movement.

Real-life challenges and scenarios

Each scenario below reflects common issues individuals and couples may face on the road to conception.

  • Irregular Cycles: If your periods are not regular, it can be hard to know when you are ovulating. Tracking your cycle and talking to a doctor can help.

  • Age-Related Fertility: Getting pregnant can be harder as you get older, but there are treatments that can help.

  • After Birth Control: Fertility usually returns quickly after stopping most birth control, but some methods take longer.

  • Male Fertility Issues: Men can improve sperm quality by eating healthy, exercising, and avoiding smoking and alcohol.

  • LGBTQ+ Options: There are many ways for LGBTQ+ individuals and couples to have children, including intrauterine insemination (IUI), in vitro fertilization (IVF), surrogacy, and adoption.

  • Chronic Illness: People with long-term health problems should talk to their doctor before trying to get pregnant.

  • Secondary Infertility: Some couples have trouble getting pregnant after having a child before. This can be due to age, health changes, or new medical issues.

  • Advanced Techniques: IVF and IUI are medical ways to help people get pregnant if they have trouble conceiving naturally.

Self-care and support

Taking care of your body and mind is important when trying to conceive:

  • Manage Stress: Try meditation, yoga, or talking to a counselor.

  • Eat Well: Choose fruits, vegetables, whole grains, and lean proteins. Women need folic acid, iron, and calcium. Men need zinc and vitamin C.

  • Exercise: Moderate activity is best. Too much intense exercise can cause problems.

  • Supplements: Prenatal vitamins, ovulation kits, and fertility-friendly lubricants can help.

When to Get Help

  • If you are under 35 and have been trying for a year without success, see a doctor.

  • If you are over 35 and have been trying for six months, see a doctor.

  • If you have very painful periods, irregular cycles, or other health problems, get checked sooner.

Doctors can run tests, suggest treatments, and offer support. There are also support groups and counselors to help with the emotional side of trying to conceive.

Common questions about conception

Many questions surround conception and the possibility of pregnancy in various scenarios. This section explores common questions and concerns about conception,

  • Can you get pregnant if ejaculation happens outside the vagina? The risk is low, but not zero.

  • Does the pull-out method work? It is not very reliable.

  • Can you get pregnant right before your period? It’s unlikely, but possible if your cycle is irregular.

  • Can you get pregnant right after your period? It’s possible, especially if you have a short cycle.

  • Is sex during ovulation the best time? Yes, this is when you are most likely to get pregnant.

  • Do condoms prevent pregnancy? Yes, if used correctly.

  • What if a condom breaks? The risk of pregnancy goes up, especially if it happens during ovulation.

  • Can you get pregnant from semen on clothes or sheets? This is very unlikely.

  • Does sex in water affect pregnancy chances? No, if sperm enters the vagina, pregnancy can happen.

  • Can you get pregnant while breastfeeding? Yes, even if your period hasn’t returned.

  • Can pre-ejaculate cause pregnancy? Yes, it can contain sperm.

  • Is pregnancy possible after ovulation? The chance is low because the egg only lives for about a day.

  • Can you get pregnant with a low sperm count? Yes, but it may take longer or need medical help.

  • Can you get pregnant with irregular periods? Yes, but tracking ovulation can help.

This article has been written by UK-based doctors and pharmacists, so some advice may not apply to US users and some suggested treatments may not be available. For more information, please see our T&Cs.