DNA test due to ultrasound???

We’ve been together for almost 4 years and never once have I stepped out this relationship. We ttc for 2 years. I found snaps of him and another woman and he was telling her he wanted to “fly her out” and was swiping up on videos of her playing with her vagina. This was Nov 2020. He proposed April 2021. I called off the engagement in Nov 2021 because I couldn’t get over the conversation. In December we decided to take a break, we started having conversations with other people although we still lived and slept together. He went through my phone one night and woke me up crying because of messages he read. After that we slowly started focusing back on eachother and started going to individual and couples counseling to make things right. Shortly after we reconciled, we finally conceived naturally. We previously tried clomid in 2020/2021 which I conceived and miscarried twice.

He’s been bummed out because at our 20 week appointment we couldn’t get a 3D ultrasound. We will be 24 weeks tomorrow, so I paid $99 for a private ultrasound to get some 3Ds. I could tell he was upset at the appointment but I wanted to wait to leave to ask what’s wrong. Now he is saying he needs a DNA test because our son does not look like him and my genes are too strong so he can’t tell he is the dad. Sometimes he says he is joking but he has brought it up more than once. I’ve been distraught and idk what to do but once baby boy is born I want to give him a DNA test just to shut him up. Sorry ladies I just really needed to vent….

***Oh I forgot to add, he says all the other 3D ultrasounds he has seen you can clearly tell who the baby’s dad is 🙄