What Week Do Pregnancy Symptoms Start?

Reviewed on 9/23/2020

Pregnancy often takes two to three weeks after sex to occur. Symptoms don't start at the same time for everyone.
Pregnancy often takes two to three weeks after sex to occur. Symptoms don't start at the same time for everyone.

Pregnancy usually takes about two to three weeks after sex to occur. Pregnancy begins when a fertilized egg attaches to the wall of the uterus, and symptoms may start in some people as early as a week after this occurs. Other people may have no signs other than a missed period until a few months into the pregnancy. 

The only way to know for sure if you are pregnant is to take a pregnancy test

What Are Common Pregnancy Symptoms?

In many women, a missed period is the first sign of pregnancy. 

Common pregnancy symptoms include:

  • Implantation bleeding
    • Occurs when a 6 to 12-day-old fertilized egg attaches to the inner lining of the uterus, resulting in light vaginal bleeding or spotting
    • Bleeding is light pinkish or brownish – usually slightly different in color than a woman’s normal menstrual period
    • Usually happens near the time of a woman’s next expected menstrual period
    • Only lasts 1 to 3 days
    • Not all women will have this symptom
  • Nausea/morning sickness
  • Vomiting
  • Tiredness/fatigue
  • Tender or swollen breasts
  • Headaches
  • Frequent urination
  • Backaches
    • Can occur in early pregnancy but are more common later, during weeks 27 to 34
  • Food cravings or food aversions
  • Darkening of the area around the nipple (areolas)
  • Mood swings caused by hormonal changes 

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Reviewed on 9/23/2020
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