I really don't want to sound b*tchy but seriously you're asking this? You will have to have a DNA test, if you don't, you will drive yourself insane!! Sorry. As for the GA, are there numbers after? I'm thinking it's for gestational age but I could be wrong, you should ask at your next appoint. Did the dr tell you how far you are? (I'm guessing if you have an u/s picture, you had an u/s and they would have measured to see how far you are) which would be your gestational age (of the baby)
Well if you had sex in Feb which was befor March it wouldent be the ex (unless is was light few spots, then maybe his, if it was normal period then you are okay) , and in April it would be your boyfriends.
what does ga stand for on the bottom of an ultrasound ?
If you had your period after you had sex with your ex, then its probably not his baby. I agree with the last poster, however, and suggest you get a DNA test.
Its impossible to answer such a vague question. You will need a DNA test to determine paternity.