Me & my boyfriend had unprotected sex on my ovulation day, he pulled out though. now my period is a day late & my discharge smells awful?

Test for Pregnancy: You have to be smarter than boys. It is very well known that any uncovered erect penis inside of a vagina during ovulation can cause pregnancy. Pre-cum leaks out of erect penises and contains the same semen with the same concentration of sperm in it as does ejaculate. Pre-cum causes pregnancy. It is time for a pregnancy test.

Do a preg test: and get checked for STD's and infection due to the foul smell.