You can’t have a period while pregnant, but some light non-menstrual bleeding or spotting can happen in early pregnancy. You could potentially confuse this with a period. Light “implantation bleeding” can happen when a fertilized egg implants in the lining of the uterus. The cervix may also generally bleed more easily during pregnancy. This can happen after sex. If you are pregnant and notice some light bleeding or spotting, then it’s always a good idea to speak to your health care provider to ensure that nothing more serious is going on.