Should i be worrying

OK so it's be 111 days since I gave birth to my daughter and I have yet to restart my period I get cramps off and on but nothing not even spotting.... And like 3 weeks after me and my husband had sex to much tmi I know but I need opinions and first we had condom on then had to stop and restart and he must have took it off and then next thing I know he was pulling out could I have gotten pregnant ????