We have just TTC. I am 31 years old. I have always had 28/27 day cycles. Last month I had a 21 day cycle. This month I ovulated on day 9, making me believe my period will again come earlier than expected.
My mother, aunts all went through menopause at 35-40 years. My doctor says since my cycles are normal (they were normal 4 months back), I have nothing to worry and can try conceiving without worrying.
However, these last two cycles have me worried. 8 months back, I had my hormone screening done at 3rd day of cycle and everything was normal.
Could these be symptoms? Should I see my OB/GYN again? Why am I having shorter cycles from past 2 months?

We have been TTC since 3 months only Please help with inputs. thanks