If you are pregnant, you will not have a period. If you have a period, you will have vaginal bleeding, which cannot be called a period, and you should go to the hospital for an ultrasound and a blood test for the concentration of chorionic gonadotropin. If the ultrasound does not reveal the gestational sac, or if there is no fetal heart or germ, and there is vaginal bleeding, it may be a spontaneous miscarriage. If the bleeding is very heavy, it is inevitable miscarriage and it is impossible to keep the baby. If you can’t see the gestational sac and you have abdominal pain, it may be an ectopic pregnancy. In any case, if you have vaginal bleeding, you must go to the hospital for examination as soon as possible.