Pregnant so soon after c-section ?

Have any moms on here gotten pregnantso soon after a c-section? My daughters gunna be 8 months and I’m worried about being pregnant again. I was supposed to start bc this month but I wanted to wait until I got my period so that I wouldn’t mess up my cycle. It is irregular and I’m now about 2-3 weeks late I took a pregnancy test about a week and a half ago and t was negative was wondering if I should maybe try another one soon ?? My boyfriend and I had sex maybe about 5 weeks ago or so or maybe 4 and he went inside me and I didn’t get the chance to have him pull out because I didn’t even know he was “going” was wondering if it’s a possibility? If anyone else got pregnant so soon after a c section and was okay? How did your experience go? I’m totally freaking out