Anyone else gain a large amount of weight fast??

I’m currently 18 weeks and I’ve gained almost 20 pounds already (I’m really short so it shows easy) I feel huge for being this far along but maybe I’m just worrying too much, I had a huge self image problem before i got pregnant and some days I won’t even walk past a mirror, some days are easier than others but just want to make sure I’m not gaining too much too fast!