Why did my period stop after my boyfriend came in me?

If your period stopped or was delayed after sex, including when your boyfriend ejaculated inside you, there are a few possible explanations. It’s important to know that sex itself doesn’t directly stop your period, but it can influence your cycle indirectly or coincide with other factors. Here’s a detailed explanation:

1. Pregnancy

  • Most important possibility: If sperm fertilizes an egg, your body produces hormones that prevent your period.

  • Even if your period had already started, implantation bleeding can sometimes be mistaken for a short or light period.

  • What to do:

    • Take a home pregnancy test 1–2 weeks after unprotected sex

    • If positive, see a healthcare provider for confirmation

2. Hormonal Fluctuations

  • Stress, excitement, or sexual activity can cause temporary hormone shifts.

  • Hormones like progesterone control the menstrual cycle, and small changes may delay or lighten bleeding.

3. Short or Light Periods Can Coincide With Sex

  • Sometimes periods naturally last 2–3 days or stop unexpectedly.

  • If your period was already light, it may have coincided with intercourse, making it seem like sex caused it.

4. Stress or Lifestyle Factors

  • Stress, travel, diet changes, or illness can delay or shorten periods.

  • Sexual activity can be exciting or stressful, which may slightly influence timing, but usually not stop a period completely.

5. What to Watch

  • Missed periods after sex should be checked with a pregnancy test.

  • If cycles remain irregular or very short consistently, consult a gynecologist.

  • Keep track of cycle length, flow, and symptoms for accurate assessment.

Summary

  • Pregnancy is the main concern if your period stops after unprotected sex.

  • Other causes include hormonal fluctuations, natural cycle variation, or stress.

  • The safest step is to take a pregnancy test and monitor your cycle.

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