Could gaining a little bit of weight cause fertility issues?

I got pregnant with my son 5 years ago first try. I was 31 at the time. No issues or complications whatsoever

I have been trying to get pregnant for a year and have been unsuccessful. I had blood work done and everything came back normal.

My doctor tried to tell me it could be my weight. I told him it absolutely is not my weight given I had no issues my first time around. Yes, I have gained weight but only 25 pounds. How could 25 pounds possibly make a difference?

I was 240 when I conceived my son. I’m 265 now. Yes I am overweight, I am not going to argue that. But I was overweight when I got pregnant with my son. Makes no sense.

Before I go and get a new doctor- can 25 pounds make a difference?