PCOS and currently on 2.5 letrozole 3rd round


I’m on my 3rd round of letrozole! 2.5 once a day. Took it cd 4 for 5 days. I’m Also on metformin. This month AF came like clock work which is the first time since starting this medication. CD 15/yesterday I started spotting when I wipe pinkish and like brownish. Is this ovulation spotting ?? Iis it a good sign?!?! God I hope so!!! Digital ovulation test had gave me flashing smiley but not solid yet! Anybody have this and resulted in pregnancy?