I and this guy had unprotectedsex. He ejaculated on my stomach but I am being paranoid coz we did it on my 13th day of cycle which I think is risky. I?

Could result in preg. Any time you have unprotected sex you leave your self open to pregnancy and the risk for STDs. Even though he completed out side of the vaginal there still could be sperm in his pre-ejaculate. If you aren't ready to have a baby use birth control to prevent unwanted pregnany.