Weight gain = Gender?

Ru

So my husband and I are having our last baby, and we’ve opted not to find out the gender in order to avoid all the commentary that comes with it. Well it’s backfired, and now all the know-it-all’s insist I’m having a boy because I haven’t gained much weight and it’s all in my belly. I am praying I have a girl just to prove them wrong (I know I’m being super immature but I blame the hormones). Any ladies out there carried one way/gained or didn’t gain/proved the old wives tales wrong? I know we can never stop other people opinions but I’d love this one to backfire!