Early ovulation.

Okay ladies. I have a question!! So I'm usually a normal 31 day cycle. Ever since I was a little girl. So on July 27th I ended my period, the 28th I already got a positive opk!!! I'm thinking I have a hormone imbalance or something, now cycle day 14 and I started my period.. a whole 17 days early. who do I talk too? Do I go to my OBGYN who I went to see when I was pregnant, or do I go to a regular primary care doctor? TIA