Clomid, metformin, ovulation

Kimberly • Perfectly Imperfect
I'm on my 3rd cycle of metformin 2000mg and my 1st cycle of clomid 50mg. I'm on day 4 of 5 with taking the clomid. This month my husband and I are gonna try using OPK's but I'm wondering when I should start testing. It said ovulation can take place 5-10 days after finishing clomid, so should I start 5 days after? , I don't want to miss peak day. Also has anyone had any success with clomid and metformin together?