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Welcome! My name is Maverick. Please give me a few minutes to analyze and/or research your inquiry and I will be back.
Normally, under these circumstances your husband would be presumed to be the father. So, the question becomes that if a paternity test now shows that your husband is in fact not the biological father, does he still have any custody rights. Let me take a look at PA law on this and I will be back...
PA law is a little different regarding the presumption I mentioned; but it also would allow your husband to file for custody rights as a third-party seeking custody/visitation. He must prove that he stands in loco parentis; that is, in the place of a parent. He can do this by showing that he has essentially assumed parental status over the child and discharged parental duties for the same. So, it is possible here that you may have share custody with your husband.
I know this is not the answer you wanted to hear, but I am assuming that you are wanting a professional and honest answer.
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