DNA Testing

Does anyone know if I can have my daughter tested before she's born to prove that the father is the father. He's been talking and probably sleeping with this other girl & claims its bcus I have been and that's how I got pregnant. Funny thing is I haven't cheated. But he's so sure. So I'd like to prove this. Any help is appreciated. We been together almost 7 years. Smh bullshit I tell u men are such fucking assholes at the wrong time. I'm 4 weeks from delivering but I seriously want a test ASAP if possible