People saying I shouldn't be showing?

So I'm almost 16 weeks and I was over at my mother in laws house and we were talking about if I can feel the baby and all that and I said not yet but Ive been feeling like my bloat is turning into baby and she goes it's WAY to early to be showing you should have nothing there at all. Come back to me when it's the size of a cantaloupe.... so now whenever I'm over there I feel like I can't relax because I have to suck in my belly so I don't look pregnant....

has this happened to anyone else?

Now I don't know when I can relax and feel normal for having a little belly.. I don't want to leave and have them say I'm just fat and it's not baby... I should not be self conscious of this but now I'm all stressed

Is this really way too big for almost 16 weeks??