Hello dear I understand your concern Pregnancy is not occur when unprotected sex was done in and around period date. It is complete safe period and ovulation is not occur during this time. So no more fertilization will occur. Period twice in month could be due to hormonal imbalance, pelvic inflammatory disorder, vaginal infection, cervix, endometrial dysplasia I would suggest to consult gynecologist for continuous bleeding and undergo examination, vaginal swab test, USG scan, PAP smear to confirm cause. progesterone pill will help you to stop bleeding. Maintain proper hygiene, eat healthy diet Best regards Dr. Sagar