I am married with 3 teens and have had irregular periods somtimes but it always came every month, but not on the same day or week. My last period was Sept. 13 and I have seen nothing yet. Three weeks ago I was sitting on the bed and had pain in my lower abdomen a few times but disregarded it. My tubes have been tied for 13 years so I am scared that if I was pregnant it was an eptopic pregnancy. I don't know what to do, any advice?