My periods were ALWAYS regular until last august/September I didn't have a period at all it never came. So I went to the doctor and they put me on birth control pills to start and regulate it. So I took the pills from last September to the end of January this year. I got my first real period in April and I also got my period in may, june and July on time like clockwork. It's now august and I am 3 weeks late for my period and having negative tests. Happen to anyone elsee??? Any thoughts??