I currently suffer from PCOS so my periods are a little hit and miss at the best of times. Recently they have managed to work themselves into a pattern. However, I had unprotected sex about a month ago and although I have not missed my period I've noticed that this one is different to others. I'm usually extremely heavy and this time it's very very light, I also have severe pain in my lower abdominal area. Where many people would assume the womb is.... Any advice would be great!