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Not being able to ovulate is an important factor and cause for infertility. Consider discussing with your treating doctor/gynecologist about going ahead with a complete infertility work-up to determine the exact cause for inability to ovulate. Weight loss is also important as increased weight can disturb hormonal balance and cause problems with ovulation.
Focus on the weight loss as directed and continue with treatment as suggested. Sometimes you can conceive without help of ovulation inducers (eg Clomid) with just the current treatment (Metformin that you are taking) and with weight loss (being in ideal weight for height range).
Take care.