Hello , Welcome to Healthcare Magic forum. It s not possible to get menstrual periods during pregnancy. Some women do experience some vaginal bleeding especially during early pregnancy which is different from menses. During menses the uterine lining or endometrium is shed which does not occur in case of pregnancy related vaginal bleeding. The causes of minor bleeding or spotting which may seem like periods but is lighter and lasts for a fewer days than the regular period, can be sex, any vaginal or internal examination by doctor, a pap smear or just a sign of the successful implantation of embryo (implantation bleeding). However if the bleeding is severe or associated with cramps or lasts longer than usual then its better to rule out serious causes like ectopic pregnancy, misscarriage, vaginal infections or placental abnormalities. So in your case it is advisable to contact your doctor or gynaecologist to thoroughly evaluate for the cause and assess for safety of fetus and rule out any risk factors. It may happen that all your reports like ultrasound , doppler, non stress tests etc may come normal and the cause could be unidentified or just implantation bleeding, but it s always better to rule out any risk prior hand during pregnancy. Wishing you good health and safe conception. Regards