I am 21 years old, and have never had regular periods. (Probably due to the fact that I am slightly underweight) I have been on both depovera and the pill, but have not taken either for about 2 years. My partner and I have been trying to conceive with no success for about a year now. I believe that this is due to my irregular cycle, but I have thoughts of infertility. Should I be worried, or am I simply being impatient?