hieee doctor.....my age is 27.i missed my periods, periods are supposed to come on 1st january 14 but today is 04th feb 14 still am not getting my periods. previously i had a surgery for endometeriosis in october12. From that time i was on sevista pill to control the size of endometerioma in my other ovary. But now pregnancy test is also negative.....is dis due to taking sevista....????am worried ???