I don't know when I ovulate. My cycles are usually about 25-26 days from first day to first day and sometimes even shorter like 23 days! The most recent was 25-1/2 days from first day to first day. My periods are 3-4 days long. I had a lot of sex 2 days after my period was over and have been feeling weird! It's not even possible I could be pregnant, is it? I would just take a test but it's too early....