Like PP, I was still bleeding at 6 weeks.
My vagina was so not ready for sex for 6 months, and the first time was rather shaky and slow and hurt a bit...I couldn't take a pounding for at least one full year postpartum.
Granted, I was 38, so no idea if I'd have bounced back quicker had I been 18.
OP, how old are you? And if you just found out you're pregnant, you must have ovulated at the very most 3 weeks ago.
I can't imagine you let him in less than a month later...girl, you must have supervagina.