Quick question

Yesterday ( 8 dpo) i woke up very nauseated and had a horrible headache all day. When i went to bathroom I wiped pink cm (not much but enough to make paper a pink color) a few times during that morning. Today (9 dpo) I had sex with my husband and bled bright red during sex. Took a shower and assumed AF was here and I was out for the month so I put a tampon in. When I went to change it there was nothing on tampon and i haven’t had any bleeding or spotting tonight. Is this just AF slowly coming on or could I still have a chance at a BFP?