Hi, I am 28 year old and I have regular periods. This is the first time I am missing my periods for 2 and half months and pregnancy test is negative as well. Doctor suggested to take regestrone cr 10 mg. Please suggest how this is going to work as I said earlier my periods are regular. Again my period going to get normal? I am really worried is this symptoms of any other things. Please guide. And I am suffering from gastric problem for these 2 months.