What is the chance I'm pregnant?

A few months ago, my boyfriend and I didn't have sex but he did put his penis inside me for a few minutes. I know this can still cause pregnancy. I've been really stressing out. I took a pregnancy test and it came out negative but my last 3 periods have been different since I the incident. They've gone from 4 to 5 days and I haven't bled as heavy as I usually do. I took another test when I would have been 8 weeks along and it was still negative. I know I'm probably not pregnant but I'm still stressing it. I've gained some weight recently and I've had an increase in discharge. No other symptoms really. What are my chances of still being pregnant?

[GRose]

If this was a few months a go and you still haven't had a positive test it is unlikely that you are pregnant. Also, the fact that you have had three periods since having sex that generally means that you are not pregnant.
I just wanted to add that you did have sex, his penis entered your vagina, you had sex. He doesn't need to finish in order for it to be considered intercourse

[Kim1989]

him putting his penis inside of you IS SEX! so you must be confused as to what sex is if you think you did not have sex.

what do you think sex is?

youve had 3 periods taken a number of tests and they have all come out negative. YOUR NOT PREGNANT