Due date and weeks where wrong ugh!!!

So after I told my doctor when I have ovulated and when I thought I got pregnant he said it was wrong and that I had to be 8 weeks from my last lmp which are irregular. Went for an ultrasound today only to find out that I am in fact 6 weeks 4 days and that is what I originally had thought but he didn't listen to me. So now I honestly feel like I need a different dr when I tell him things he just tells me I'm wrong and keeps talking. He doesn't take anything i say into consideration.