PCOS And The Mystery Cycles

As
Needing some PCOS sympathizer buddies!  I am currently following my RE's advice to try metformin for two months before adding in Clomid.  I am so frustrated with never knowing when or if I've ovulated.   My husband and I have been TTC now for just over 18 mo and I was diagnosed with PCOS in April. I know many of you are much further into TTC than we are and aid appreciate any advice.  Currently way emotional and as always this could mean it's time to try, try, try OR about time to hit AF and another month a crushing disappointment.  
Ovulation kits have never worked for me and taking them throughout a whole cycle gets expensive.  Any advice?!  
💕💕💕