Kinda crappy 😥 need some confidence

So anyways my SIL just had a baby. 7.11 lbs I know small baby! And I know wight size im bigger than her and all. I had my baby boy at 9.15 lbs. Yesterday my BIL was saying its obviously because I'm bigger so naturally I'll have big babies. I'm 5'4 and 190lbs being 21 weeks pregnant right now. Well I've always been really self conscious of being overweight. First pre pregnancy I was 157. And I got really big and had a big baby. Now we're expecting a baby girl and I just can't be excited and happy couse I'll I think about is being big and having a huge baby obviously!! I know it shouldn't bug me that much, and I should love myself more. It's been 2 days and I still won't stop thinking about it. It just bugs me ahhhh!