Here is my story I had gotten pregnant on wedding night (didnt plan that), and had a chemical pregnancy on Sept 17 which is the day I started bleeding. Before this I was regularly on a 28 day cycle because I was on the pill. So my question is how do I calculate when I should get AF. I was technically 30 something days late with the chemical. We did ttc this month and I am anxious because I dont know when I should have AF!!!!