Poor weight gain

My baby boy is only 9lbs 7ounces at 9 weeks old. I have to go back in a week to weigh him. I’m EBF. I haven’t been eating as well as I could be (not enough) and am afraid it’s affecting my milk. I will improve my diet/hydration and encourage him to eat more often. He has plenty of wet and poopy diapers and seems content after feedings. I guess I’m just looking for support... anyone else struggling with weigh gain?