So glad I found this today! I'm on the pill and have been for years and like clockwork, get my period 3 days after I take the last one. I got mine yesterday which is the day after I took my last pill, and have had awful cramps all day today. I was thinking it had to be something with the food changes I've been doing … currently finishing up Day 14. Thankfully, it sounds like what is going on IS related to the decrease of hormone-infested food I used to eat!