When Will Follicles Rupture After Taking Clomid?

hello doctor,.i have 35 days regular cycle..had missed abortion 6 months back. i took clomid 2-6 days.scan on 12th day rt ovary 18*16 and left ovary 14*12..scan on 14th day, dominant follicel rt ovary 21*20 and left only small follicles.ET 9mm..want to know when follicle wud rupture.?then what happened to the follicle on the left ovary sized 14*12?