Hello Chances of being pregnant very much likely with unprotected sex especially near ovulation If you can tell me about your last period and on which day of cycle you had unprotected sex, I will be able to tell you better In my opinion you should rule out pregnancy first by doing urine pregnancy card test which can be done at home by using first voided urine sample or another method is transvaginal Ultrasound. Pain in abdomen might be related to infection or acid peptic disease or early stages of pregnancy which warrants derailed evaluation to establish a diagnosis. Please write back to me with all relevant information so that I will be able to tell you more accurately. Thanks for your question Wish you good health