My husband and I are trying to conceive. I have been keeping track of my cycle and according to an ovulation calculator I was supposed to ovulate around the 4th of October. My period was supposed to start on Monday the 17th. It is now the 20th and I still have not started my period. A couple days ago I had some slight pains on the lower right side of my abdomen that only lasted an hour tops. I have taken several home pregnancy tests and all have came up negative. I am wondering what I should do now. I'm worried that I may not be pregnant and it could be something else.