In order to fight the chance that he is a chimera (slim of a chance though it is), you might have your lawyer request a blood test and a cheek swab from the guy, not just one or the other. It will also reduce the chance that he figured out a way to fake a cheek swab (I don't know how someone could do that, but you want to cover all your bases).
What I meant by that last is, given that you didn't sleep with anyone else, the first logical explanation is that he figured out a way to fake the test.
I am very suspicious of his resistance to test again. It is cheaper to do another DNA test than to go to court and fight it.
I'd be worried about two things. One, that he will find some way to fake the test again. Ask for witnesses, ask to be there, ask for a disinterested and highly respected lab. Two, that (rare as this is) he might be a chimera.
But frankly, if you didn't sleep with anyone else, the simplest explanation is that he found a way to fake the test. Let's hope he doesn't have a way to do that again.
Obviously I meant a request for dismissal. And yes I have no doubt that the judge will order a new test. I don't have the court date yet, but my lawyers did give me a worst case situation as in the new test coming back negative.
He has not filed "a dismissal," he has at best filed a request for a dismissal, or a request for summary judgement. But since prenatal DNA tests have not yet been approved by the courts for purposes of determining paternity, it would be a poor judge who would grant summary judgement based on one being done before the baby was even born.
He has filed a dismissal and sanctions based on this prenatal test. I have no doubt that the judge will order a retest. But if that retest comes back negative I could get 10 days in jail ( I doubt a judge would order that) and I will have to pay all his legal fees and mine. At the dismissal hearing I will have to testify and then the judge will decide if he will order a new test.