I have an irregular, very short cycle. Between 16 and 20 days. I started clomid days 5-9 this cycle to induce ovulation. I got positive opk cycle days 14,15,16, however my period will be starting soon if I don't ovulate. I have heard an lh surge can happen before period starts too. How do i know if i ovulated for sure or not? It feels as if I am getting my period soon and therefore my lh surge/positive opk was not due to ovulation....