Hi, If You have regular cycles of 30 days then the first week and the last week of menstrual cycle are safe. If you have sex during that time, it does not cause pregnancy. Don t worry. Occasionally a period may get delayed and this is normal. Period also gets delayed if you have emotional or physical stress too. Take progesterone to start your period. Just for your information I am writing about medical abortion. Medicines can be used to abort baby for up to 9 weeks of pregnancy. This is called medical abortion. For this first you should consult family physician /Gynecologist. Before the treatment it is important to have examination by her to make sure that the pregnancy is in the uterus and you do not have contraindications for the medications. In Medical abortion there are two types of medicines ( anti progesterone and prostaglandin) used for abortion. Medical abortion is about 95% effective. Most women ( 80%) abort within 24 hours of taking the second pill. Some take little longer. After aborting the pregnancy you may have light bleeding for two weeks. Get an ultrasound done after two weeks to make sure that the abortion process is complete. If you have heavy bleeding (soaks 2pads/hour for more than two hours) or if the bleeding persists even after 2 weeks you must see the doctor. To avoid such unnecessary stress I advise you to consult your doctor and start regular contraception like hormonal contraception or have an intrauterine devise fitted as they are very effective in preventing pregnancy. I hope I have answered to your satisfaction. If you have any further queries do contact me through healthcare magic