So yesterday after I had gotten home from class I was cooking and felt some cramps so I went the bathroom. And it felt as if I were giving birth (not pregnant) so I got up and went turn my food off and as I was walking to go lay down I collapsed the pain was so bad. I luckily was holding my phone when I fell so I called my sister who lives nearby and she came give me ibprophin and help me get into a warm bath. I'm supposed to start my period in a week and I haven't had any sign of blood. Just a tight soreness in my uterus. I recently got off of birthcontrol aswell. I'm going to my obgyn Thursday. Any idea what it could be?