Yes. I was on the pill when I was newly married, then for a period of time after my 3rd. Then, after our 4th, I went back on. That is when it was really weird. My periods were all over the place. I was an emotional wreck. I mentioned it to some friends. One of them pointed out to me that BCPs are abortifiacient. I totally did not believe her. She did not argue with me at all. She just suggested that I research it. So I did. I wept at what I found. My husband was also devastated by the news. Needless to say, we immediately went off of them. The low-dose pills are the ones that are the worst for this as it heavily relies upon this part of the way all the pills work as a primary method of helping you not be "pregnant." The thing is, it makes the lining of your uterus inhospitable to inplantation. So, if an egg does get fertilized in a particular month, it has nowhere to go. It can't implant, so it is flushed away in your period. You are so early in your cycle, that the pill is causing hormones to interact with the natural way your body would work at this point. It isn't normal for you to have progesterone at this time of month. But the pill is pumping you with progesterone so that your body thinks it is pregnant. That is why you feel the way you do. I highly caution women from messing with their hormones. There are so many consequences for doing so. It isn't "natural" for a woman to do this. You may also find your desire for your husband is diminished. That is one thing that I found amazing: our intimacy was so different after we stopped using BCPs. I can't even explain it, but I think it must be on some emotional level or something. It's like all of a sudden my husband didn't despise the way my body was made (to produce children), and we could just enjoy each other without any fear. It was like opening a secret door that we didn't even know was there. We marvel at it still, and that was over 8 years ago! BTW, we've only had 2 children in those 8 years that we have not tried to prevent them. You won't necessarily end up with 20 children. :)