I am currently on the combined pill and take it the same time every day. Have been on it for years. Last month I took one of the pills around 20 minutes late but that was it. I had unprotected sex on 9th April and got my withdrawal bleed as usual two weeks later. Lasted the full 7 days as usual. Recently I've been feeling bloated and had stomach cramps and thrown up once after feeling queasy.  I've taken 3 pregnancy tests over the past three days and all have come back negative. What are the chances of me being pregnant?