Okay a little helpful advice needed before the panic sets in

Hey well I got this app cause it looked easy to use and I was able to pit everything in it now here's the fun part... Today I feel like death throwing up sore mood swings are giving me whiplash also it's saying I should of had a period last week well I did not and I know have sex run risk of being pregnant I have had two kids before one 6 other 3 this guy does not want to have children also he's a big kid himself now here's the question has anyone ever heard of the rod running out 2 months before it should??? Cause I know this feeling