My "usual" ovulation time is around CD13. I've been getting positive opks since the 9th. Im currently on CD 16. I took Letrozole this cycle and found out I have 4 follicles 2 of which are mature enough. Has anyone had this problem or know of why it's going so long? Also is it possible it keeps saying positive because the follicles are ovulating on different days? We've been BD a lot and supply is getting low.