Well umm I had sex during my period (3rd day ) with my bf and I know there's always a chance to get prego when you have unprotected sex .. Etc.. my periods are irregular and usually last for 4 days (heavy) he certainly didn't cum and it was only for 3 minutes because I was panicking and it was first time having sex without being protected . I have no idea about precum . I just want to know what my chances could be?.