Babies dad

So now my sons dad is denying paternity. How do I address this? I looked into prenatal paternity test. They are not in budget. Plus he wants me to pay half.

I know that paternity tests will be needed. My question is how do I address that I do not have the money now (insurance wont pay) and that he needs to wait until baby is born. For a prenatal paternity test amnio is $400 plus the amnio cost itself. Amnio runs 1 in 300 to 1 in 500 risk of miscarriage (no thanks). Non invasive runs atleast $1500. Plus both are done by mail... Im pretty sure he will try and say that I "altered" the results

Sorry for not clarifying. I am currently 22weeks pregnant. The baby he is questioning is unborn