Is this long enough?

Topaz • Married. Dog mom. Go CAVS!
I've been on Metformin now for only two weeks. Found out I'm pregnant again for the 6th time. Have I been on the Metformin long enough to help support the pregnancy? I haven't even reached my max dosage yet of 1500mg. 500mg for the first week and 1000mg the second. I'm just curious if anyone has had a successful pregnancy so early with treatment? 
After 5 losses I'm preparing myself for another yet still hold out hope that the Metformin will do the trick.