Summarize the following:
During pregnancy, women do not menstruate. While you may experience some light spotting, you will not have your period during the course of pregnancy. If your period has suddenly stopped, pregnancy may be the cause.  Many home pregnancy tests are accurate on the first day of a missed period. For most tests, you immerse a small stick in urine and wait several minutes for results. A plus sign, changed colors, or the word "pregnant" indicate pregnancy depending on the test.  Home pregnancy tests are generally very accurate. Most are about 99% accurate, but some tests are not as good as detecting pregnancy as they claim. It might be a good idea to take two different tests to assure accuracy.  It's important to see a doctor as soon as possible to confirm your pregnancy with a blood test. Usually, after pregnancy menstruation returns. However, if you're breastfeeding you may not return to regular periods immediately. Breastfeeding regularly can delay the return of your periods for the first months after pregnancy. If menstruation is delayed longer, however, you should talk to your doctor to rule out other causes. Your period may take awhile to return to normal after a pregnancy. This does not mean menstruation has stopped longterm.  Usually, once you cease breastfeeding you'll begin spotting lightly. Your menstrual cycle should return to normal within the first few months after you start spotting.  You may have unusually large blood clots during your first periods after pregnancy. This is usually not a concern, but if you have heavy bleeding and blood clots for a week or more consult a doctor.  Remember, even if you don't physically notice signs of menstruation you may still be fertile even shortly after pregnancy. Make sure to use contraception if you want to prevent another pregnancy, even if you're not visibly menstruating.
Take a pregnancy test. Consider the effects of breastfeeding. Understand menstruation may be irregular after pregnancy.