Overweight & trying to get pregnant

Hello 💗 As you read above, I’m overweight and trying to get pregnant. I recently got married and want to get pregnant. But my problem is that I’m very overweight, I guess you could say obese 🤦🏻‍♀️🤷🏻‍♀️ My period is also irregular because of that same reason as well. I’m aware that pregnancy when you are overweight can be very risky and can carry some health problems. Which is why I’d like to start to lose weight. But I’m scared that I could get pregnant while trying to lose weight and that the diet I’d be following (none in specific) could affect the baby somehow. Is that a possibility? What should I do? Any recommendations?