Any advice or tips about to go on clomid

Hey!

34 years old and have Been ttc for 17 months now! It feels like it's been 17 years. All my labs and tests have come back normal as well as my DH tests. Which makes it even more depressing. We don't have an answer on why we can't. My OB started me on metformin 3 months ago and this cycle I will begin Clomid. My cycles are relatively consistent , 27-29 days with a 30 thrown in here and there. I am a late ovulator usually day 15-16.

Thanks!