Early ultrasounds tend to be pretty accurate. Also, keep in mind your baby's "age" is dated from the start of your last period (NOT the date of conception), so if you measured 15w2d, you would count back exactly that amount of time to what should have been the start of your last period (and sounds like it was very close to the start of your 3/6-3/10 period). So yes, it's almost certain that this is your boyfriend's child.
Good luck. It sounds like things line up to be your boyfriend's baby. You should get some STI testing done. Some things can hurt yourself or your baby if left untreated.
Baby boy H is here! Born 2/1/2014
Mysterious_wife: "And for the love of all things that sparkle, remove your last name" on BOTB.
My question is why the need for 2 new posts about this same crap? Whether this is MUD or real, the result is the same. The timeline suggests your BF is the father, so if you have other shit to deal with then just deal with it! What do you expect any of us to do about it?
Re: .
Good luck with everything.
I agree with DT on this. I've seen some pretty crazy shit on here. This is pretty mild.