*tmi alert* so i am kinda worried... i have had sex with my fiance after we had our baby she is now…

*tmi alert*

so i am kinda worried... i have had sex with my fiance after we had our baby she is now 9 weeks old... well for the past few days I have been spotting on and off... tho has never happened to me before even after I had my first daughter... we used condoms and the pull out method and I know u can get prego on that but do u think it could be that or just my body getting back to normal? it wasnt even time for my period yet...