I am 20 years old and I have never missed a period before.. I am not sexually active so I can definitely say I am not pregnant. Last month I was laid up with a broken foot and was taking a lot of Ibuprofen I don't know if that could effect it or not. But I'm almost 3 weeks over due for my period to start. Do I need to go see a doctor or should a wait a month or so to see if it comes back on its own?