anyone here use Metformin for conception?

Caitlyn • I`m a momma of a beautiful 3 year old trying to conceive my 2nd
Anyone here ever use or are currently using metformin to conceive? What're your experiences? My OB is having me try it because I am ovulating too late in my cycle for my uterus to implant a fertilized egg. I'm going to be on it for 2 months and if it hasn't regulated when I ovulate, I'll be on clomid. 
How long has it taken you to get pregnant using metformin? Did it work for you?