Would rather do it alone.

Been with my SO for almost 5 years now and ive posted this topic before but i just need to vent , ive never cheated on him and hes now denying our 2nd baby on the way because our baby measured bigger on our first scan so how big the baby is for him means thats when we concieved🤦🏻‍♀️ he talks about dna testing when hes born and i keep telling him go for it ! But he repeats it over and over and eventually i get upset because he sounds like a broken record and im just over it , i cant be happy ans talk about this pregnancy with him id rather do all this alone then feel like i cant talk about my child