Weight gain

I'm stressing. I've gained 9 lbs at 15 weeks. I definitely didn't gain it this fast with my first two. I'm active and eat healthy, but overeat the healthy things for sure. I'm just worried in going to be a giant balloon. I struggle with self-esteem issues. Will the weight gain slow down? I'm trying to limit myself from overeating, but now I'm just so sad about myself that in the moment I don't care.

Any encouragement?