Me n my bf had unprotected sex july 28 I usually start my period between the 31 or the 1st well we got done with are business n there way a lil blood on his thing I really didn't think anything of it just thought I was gonna start my period early when I took the tampons out the next morning it was a brownish color like I was just ending my period . It lasted 5 days n bow nothing is this possible can I be pregnant just like that