I am a 35 year old woman with no medical history of bad periods or lower abdominal problems, for the past 3 days i have experienced lower abdominal pains, which are dull, aching and intense. I don't wake up with them but after 12pm I start to experience really bad pains which last the rest of the day and night unless i take a pain killer, I am on day 20 of my menstrual cycle and am not on the pill and have regualr intercourse, could this be related?