I'm almost 21 weeks pregnant and I am wondering if you should be able to tell by now? it's my first child and I'm excited but also scared and my family thinks I'm having twins because I have a noticeable bump even with loose clothes... How big should I be? an I haven't seen a Dr. at all yet but I've been taking the vitamins, eating healthily, and working out too so anyone have advice or an opinion of how big I should be?