Hi I'm not sure on how to work this app totally as of yet. But I'm after a little advice I've been having regular periods for a good while now whilst using this app turning the day it says on here etc I was due on the 31st October and I still haven't came on however I've done 2 tests and they both negative. Could it be too soon?? I also have the horrible metal taste in my mouth, very tired. I have had 2 pregnancies but don't remember anything like this. I had pretty straight forward pregnancies and found out very early on.