I can totally see where the mistake came into it chick, but at least you have your head screwed on and used protection.
I agree with everyone else, it's most likely your partners, and if he was involved in the mistake, he should know that the baby is his knowing you used protection and it didn't split.
Maybe the asking for DNA test was just a shock thing for him.
Me and my OH have never used protection, and I'd never been on anything for like 3 years beforehand, never got caught.
Never got caught with my OH until recently! Even then we both agreed when we got together we wouldn't use anything and when I suggested going on the pill until after our wedding (as I bought my dress already) he got upset about it so I chose not to....
When I got caught he said "I didnt actually think youd get pregnant" but he is as happy as larry about the bubba.
Men have a funny way of showing their feelings. And maybe the DNA thing could have been a little thing to take his mind off being a dad, as in a way he can feel its not his until those results come back.
Enjoy your pregnancy!!!!!! x