<s>[INST] Hello . I worried I may be pregnant. My last menstrual period was on August 13. I had unprotected sex on the 8th of September. My boyfriends worried he might have came in me. I was supposed to get my period on September 10th according to my period calander. I ovulated on September 3rd. [/INST] Hello dairy understand your concerned;yes period is most common by the pregnancy after having unprotected sex. Your last period date is 13th august. Next expected period date :10th Septembers your cycle is of 27 days. If it is regular then ovulation will occur around at 26th -27th august. So according to my you have done sex on the 8th September, and it is safe period. During this time there is no ovulation, so no fertilization will occur so no chance of the pregnancy. Your delayed period could be due to some other reason like excessive stress, change in dietary habit and lifestyle, hormonal imbalance. Wait for the period to come. If period will delay by more than 2 weeks then consult the gynecologist and undergo blood Chat Doctor, reproductive hormone analysis and examination.Meanwhile, avoid sex, eat healthy diet, Chat Doctor. In absence of pregnancy period can be induced by the progesterone pill. Hope this may help noncontact Chat Doctor for further query Best regards </s>