pregnant, you sent me a p.m. but I can't answer it because you have blocked your account from receiving private messages. If you have 56 day cycles, it is unsurprising that you didn't have a period between the guys. The baby is measured at its actual size, and would not be confused for a baby of a different conception date. I notice that you've been posting on other forums and asking people things like "so there's NO WAY the baby could have been from the first guy?" I suggest you trust the advice you have been given, and especially trust your doctor.
Well, for what it is worth, sometimes it's easier to focus on imaginary possible wrong conception dates than it is to have to think about what it might mean in your life that you behaved in a way not exactly in line with your values. Work out why this happened and if it has ramifications for the future, and make promises to yourself about how you will behave from now on, and you'll probably notice that random worries about the conception date will fade.
Thanks for your advice, I know sperm can last only 5-7 days max which is why I'm not too worried but sometimes I just re-think about it just to be sure. Because I am married and guy B is my husband.