I am 25 years old and have regular periods for the last 5 years however recently I have not had my period in 3 months, I have taken a lot of at home tests all negative I do have an apt. with my doc on this Monday however, I am wondering if there is something else it could be I know its not stress or weight gain or loss. Or if I am by some chance pregnant shouldn't I have many signs because I would be at like week 11 or so...