Ugh. BFN Again...

Kate • 33. Canadian. TTC #1 since Aug. 2014. PCOS. MC in June 2016. Uterine septum and ovarian cyst removed January 2017. Started Metformin January 2018.
I've tested on 9dpo, 10dpo, 11dpo and 13dpo. All negative. What a waste of HPTs! 
AF is due 28th. Think I'll just wait now to see if she shows. 
Anyone get a BFP later? Tell me about it! ?