Most couples have questions about this and few feel comfortable asking. The short answer is that sex is safe throughout pregnancy for the great majority of women, and it will not harm your baby.

Why it's safe

Your baby is well protected — cushioned by amniotic fluid inside a muscular womb, and sealed off by a plug of thick mucus at the cervix. Penetration does not reach or affect the baby.

When to avoid it, or check first

There are situations where your doctor will advise against sex. Ask if any of these apply to you:

  • Placenta praevia — where the placenta lies low and covers the cervix
  • Waters have broken (including PPROM — preterm premature rupture of membranes)
  • Threatened miscarriage, or bleeding in this pregnancy
  • A history of preterm labour, or signs of it now
  • A cervical stitch in place
  • Expecting twins or more, in some circumstances

One specific safety point: do not blow air into the vagina during oral sex at any stage of pregnancy. It is very rare, but air can enter the bloodstream and cause serious harm.

See a doctor if you have bleeding after sex, persistent pain, or contractions that continue rather than settling.

Desire changes — in both directions

Hormones, tiredness, nausea and body image all affect how you feel, and there is no normal pattern.

  • First trimester — nausea and exhaustion mean many women have little interest.
  • Second trimester — often the easiest phase; some women find desire increases.
  • Third trimester — physical size, discomfort and tiredness commonly reduce interest again.

Both directions are normal. So is not wanting sex at all for part or all of pregnancy — that is not something to apologise for or to push through.

Partners often have their own worries, commonly a fear of causing harm. Saying so out loud usually helps more than either person expects.

Staying comfortable

As pregnancy progresses, some positions become awkward. Avoid lying flat on your back for long periods in later pregnancy, as the weight of the womb can press on a major blood vessel and make you feel faint. Positions where you are on your side, or have more control over depth and movement, tend to work better.

Increased vaginal discharge is normal in pregnancy; some women find lubricant helpful. Go by what feels comfortable, and stop if anything hurts.

Intimacy does not have to mean intercourse. For many couples, other forms of closeness matter just as much during these months.

Common myths

“Sex can hurt the baby.” It cannot, in an uncomplicated pregnancy.

“Sex causes miscarriage.” It does not. Most early miscarriages are due to chromosomal problems in the pregnancy itself and nothing either partner did.

“Sex brings on labour.” Orgasm can cause mild tightenings, and semen contains prostaglandins, but in a healthy pregnancy this does not trigger preterm labour. At term, evidence that sex reliably starts labour is weak — it does no harm to try, but do not expect much.

Afterwards

After birth, wait until bleeding has stopped and you feel ready — physically and emotionally. There is no fixed timetable, and for many couples it takes longer than expected. Remember that you can become pregnant again before your periods return, so discuss contraception before you resume.

The bottom line

Sex is safe in most pregnancies and will not harm your baby. Check with your doctor if you have placenta praevia, bleeding, ruptured membranes or a history of preterm labour. Expect desire to fluctuate, talk to each other about it, and let comfort guide you.

References

  1. National Health Service. Keeping well in pregnancy [Internet]. NHS; [cited 2026 Jul 22]. Available from: https://www.nhs.uk/pregnancy/keeping-well/
  2. National Health Service. Sex and contraception after birth [Internet]. NHS; [cited 2026 Jul 22]. Available from: https://www.nhs.uk/conditions/baby/support-and-services/sex-and-contraception-after-birth/
  3. Royal College of Obstetricians and Gynaecologists. Patient information leaflets [Internet]. London: RCOG; [cited 2026 Jul 22]. Available from: https://www.rcog.org.uk/for-the-public/browse-our-patient-information/