What happens when you are pregnant and still have a period. The most typical symptom of pregnancy is menopause, which means that there should be no vaginal bleeding. If you are pregnant and have vaginal bleeding, the first thing to consider is that there are several possible cases: the first is the implantation of a fertilized egg in the uterine cavity, which may lead to vaginal bleeding, in which case you must be less active and rest more. In the second case, if the vaginal bleeding is accompanied by severe pain in the abdomen, the pregnancy may be ectopic. The third type is if there is pain in the abdomen, a little swelling in the abdomen and vaginal bleeding, there may be signs of pre-eclampsia, so it is necessary to take blood to check the HCG and progesterone level.