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Sex in your first trimester: things you should know
Article

Sex in your first trimester: things you should know

2 min readWeek 9
Key takeaways
2 min
  • Continue having sex during your first trimester as it's completely safe in most healthy pregnancies and won't harm your baby or cause miscarriage.
  • Understand that orgasms actually benefit your healthy pregnancy by increasing oxygen flow to pelvic organs and releasing calming hormones.
  • Avoid sexual contact if you experience bleeding, severe abdominal pain, have a history of miscarriages, or if either partner has an STI.
  • Expect changes in libido during your healthy pregnancy due to nausea, mood swings, and hormonal fluctuations - this is completely normal.
  • Consult your healthcare provider immediately if you notice any unusual symptoms like bleeding or severe pain after intercourse.

Sex during first trimester is completely safe for most healthy pregnancies. It won't harm your baby, cause miscarriage, or interfere with development. Orgasms actually benefit pregnancy by increasing oxygen flow and releasing calming hormones.

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Many couples stop having sex after conceiving, fearing it might hurt the baby. But in most cases, it's completely safe.

Can new sperm damage an already fertilized egg?

No. The egg undergoes significant changes when it becomes fertilized. Once fertilized, new sperm can not penetrate the egg.

Orgasm affects the uterus. Can it interfere with embryo implantation?

The contraction of the walls of the uterus during orgasm cannot interfere with attachment.

Can sex and orgasm provoke a miscarriage?

Sexual activity is not the cause of early pregnancy loss [1]. And an orgasm is even useful. During the contraction of the uterus, oxygen intensively saturates the pelvic organs, which means that the embryo gets more of it. In addition, during orgasm, pleasure hormones — oxytocin, prolactin and a group of substances called endorphins — are released once. These relax and calm the expectant mother.

Does sperm somehow affect hormones and the state of the genital tract during pregnancy? Do I need to protect myself with a condom?

Semen contains hormones and prostaglandins that can cause uterine contractions, but they are too small to affect the course of pregnancy. Sperm has no positive or negative effect on hormones or the condition of the genital tract. The only exception is if your partner has a venereal infection. Therefore, if you are not sure about your partner's health, then, of course, you should use a condom.

What if I don’t want to have sex?

Your body is changing, so if you experience a little discomfort during intercourse, change your position or take a break for a while. During pregnancy, sexual desire is like a pendulum: your desire for sex may increase at times and also descrease from your normal libido.

Often the first trimester is uncomfortable — nausea, mood swings, and discomfort in the lower abdomen. Naturally, in this state, you may not want to have sex. At a later date, a decrease in libido may be associated with an increase in prolactin levels [2].

Are there any real reasons to avoid having sex in the first trimester?

There is no evidence that the risks of complications increase with sex [3]. However, it is best to avoid sexual contact and consult a doctor in the following cases:


Frequently asked questions

Yes, sex is completely safe during the first trimester of a healthy pregnancy. Sexual activity cannot harm your baby, cause miscarriage, or interfere with embryo implantation in normal pregnancies.

No, orgasms cannot hurt your baby during a healthy pregnancy. In fact, orgasms are beneficial as they increase oxygen flow to pelvic organs and release calming hormones like oxytocin and endorphins.

Avoid sex if you have bleeding, severe abdominal pain, history of miscarriages, cervical insufficiency, or if either partner has an STI. Always consult your doctor if you experience unusual symptoms.

Decreased libido during first trimester is normal due to nausea, mood swings, breast tenderness, and hormonal changes. Your sexual desire may fluctuate throughout your healthy pregnancy.

You only need condoms during pregnancy if you're unsure about your partner's STI status. Sperm won't harm your healthy pregnancy, but sexually transmitted infections can cause complications.

Medical Disclaimer

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or qualified health provider with any questions you may have regarding a medical condition.

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Reviewed by healthcare professionals · Updated March 25, 2025

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