Could my husband be cheating

I was cleaning my car and i found an empty condom. It’s definitely not mine. He said it’s not his and that it’s mine…i think he’s playing these mind games about “keep the condom we’ll get a DNA test” probably knowing damn well i threw it away, im not keeping that. This hurts my feelings im 27 weeks pregnant. He puts it on everything that it’s not his and that he’s never cheated… he’s like “shouldn’t i be mad and flipping out on you because you found it in your car , it’s not mine it’s yours,” and my response was you know why you’re not flipping out on me because it’s yours and clearly indenial about it because if it really wasn’t yours you’d be super upset I found it and start questioning me.

We share a car for now. Idk what to think or do guys.