My cycle is pretty normal, or so I thought.. Last Af was 9/19.. I started bc that Friday 9/25 & stopped taking it a week later 10/2 so me & so can ttc. We've had sex a few times while I was on bc & as soon as I got off. I started spotting the night of10/3 & I'm not sure if it's Af now, but I'm flowing heavy.. Af wasn't supposed to be here until 10/18.. Can anyone help me figure out what's wrong?