Hello. Just joined the community. I have pcos and finished my very first round of Letrozole on sunday. I am now on cd 12- have been opk for the last 3 days and still no real positive. I am using the clearblue digital with the smiley faces... all have been neg so far, but I looked online and saw that these tests dont always work esp with woman that have pcos. Does anyone have any insight on when I MIGHT ovulate? >> I took Letrozole cd 4-8, started opk on cd10. Feeling lower back cramps, slight cramping in general, boobs hurt, headache... any help would be nice!