Father guess?

I had my period on January 2, I was on BC but got off around August so this was my first period since then. Had sex with Guy A 11 and 16 of January. I broke off engagement and on February 7 had sex with Guy B. Guy B says he never finished. Guy A finished every time we had sex. I am 31 weeks and my due date is October 19. Who could be the father? (Can’t afford DNA test right now and when I asked OB she said most likely guy A. Guy B least likely or impossible. I am hesitant to believe her because she gave me the wron gender and then said I had gestational diabetes when I didn’t.) please don’t judge me or be too harsh. I know I should have used protection and I’ve been having bad anxiety about everything