I wish I knew of something, but it seems like the best chances I usually read about are going low carb, losing weight, and taking met.
I would strongly suggest losing as much weight as possible before ttc. Weight gain in pregnancy, and obesity in pregnancy, can put you and your baby at a much higher risk for complications. You can develop pre-eclampsia, among other conditions, which can be fatal to your and your baby. Your baby can also develop other birth defects. You can read more about that
here.
If you are closer to goal weight when you get pregnant, you'll really be able to enjoy the pregnancy much more, exercise, have a healthy baby, lower risks of gestational diabetes, c-section, birth defects, miscarriage, premature labor, and recover from those first few months of motherhood!
Also,
tests have shown that children of obese pregnant mothers are more likely to be obese children, and children of mothers with increased blood pressure in pregnancy will have higher blood pressure than other children their age.
Edited to say, I'm not trying to be a nag. I should have lost weight before getting pregnant, also. I was young and wanting a baby very badly, and had no idea I was at higher risk. I eventually had my labor induced 3 weeks premature due to pre-eclampsia, after a few weeks of bedrest. I found out when he was around 12, that he actually has a benign form of spina bifida. It would have never been seen except for an an xray.