###Human: Why do I have abdominal pain after unprotected sex? ###Assistant: Hello. The symptoms appear more of premenstrual syndrome and as you had a day of bleeding with on and off lower abdominal pain off and on. There is likelihood that your menses shall resume again in few days unless you have conceived. Urine pregnancy test is not sensitive until eight days post missed periods and hence it is advised that you should opt for a blood based serum beta-hCG (human chorionic gonadotropin) test to rule out pregnancy conclusively. If the hCG levels are less than 5 ng/dL then you are surely not pregnant. But if they are higher then you are surely pregnant and the bleed that you had was an implantation bleed possibly or an early sign of threatened miscarriage. So, please get a serum beta-hCG test done to have a clear idea with regards to possible pregnancy as you had sex during your fertile period. Revert back after the test to an obstetrician and gynaecologist online -->