Dad wants a dna test

He wants a dna test but doesn’t want to do the prenatal test because it cost more so he wants to wait 8 more months when the baby is already here. This is frustrating me so much I even offered to pay for half of the prenatal test. I want to do it now because I don’t want him and his wishy washy ass mom holding this over my head for the rest of my pregnancy. I’m getting the NIPT done in about 3 weeks do y’all know if they could test paternity with that test??