I need answers!!

Okay so I recently stopped take my B.C. (Sprintec). I stopped taking it because I didn't react to the hormones good after taking it for a little over 6 months or so. My last time taking a full pack was a little after June 24th & my last "period" w/ BC was 7/19-7/22. I recently had sex w/no protection (yes I know🙄😅) on the 13th. Earlier this week I was having some back pains & pains near my lower abdomen. According to eve my fertility started two days ago. Yesterday I did get a little blood specs & today I had a sploosh of 🔴 while sitting on the 🚽 toilet so I'm thinking hey maybe it's my period starting. But my period isn't suppose to start until next week.