In order to answer this question, it is important to understand why you might be taking the metformin. If you do not ovulate regularly, and after you start to take metformin it helps you to ovulate, the it will help you to get pregnant since it's main reproductive benefit is to aid women who do not ovulate regularly to ovulate. If you are already ovulating regularly and are having regular periods, then metformin will not help you to get pregnant. Of course, if you need metformin for other reasons, such as diabetes, then you should take it regardless.
No, metformin has been proven to increase egg quality..but that doesn't increase your chances of getting pregnant. Be careful, it causes major dehydration. Take it slow, start with one pill a day for at least 2 weeks. It also irritates the stomach. You can also eat a diet that is high in protein...less carbs...seems to be tolerated more when you're on metformin.
good luck!
For me, I have irregular periods, mild PCOS, I ovulate sometimes on time sometimes late, sometimes not at all....So asked my doc if he wanted to give me metformin with Femara...HE checked my blood insulin test...and it came back within range so did not give me metformin