I am also on metformin and I take Clomid, Bravelle and the Ovidrel trigger. I don't think my tech has ever told me my sizes at a baseline. They just check to see if there are any cysts and what the lining looks like. But those sound ak to me. When I went in on wednesday after taking 100mg of clomid x 5 days and 2 bravelle shots my follicles were 15 and 16 mm. I took another shot that night and the trigger last night. My husband and I are trying TI, but we may have to go to IUI next month.
Good luck with your cycle!

I'll be waiting for an update!!