16 weeks and not showing?!!!!! 💔

I'm 16 weeks pregnant today yayyyy! The only problem is that I'm not showing what so ever. I told a couple of co-workers when I found out and since I haven't talked about my pregnancy (because it's none of their business) they had the nerve to ask if I had a miscarriage or something because I haven't talked about the baby and I'm not even showing at all. They even compared me to another girl who is also expecting and due around the same time I am due and she's definitely showing. This is my second pregnancy, I thought I'd be showing earlier? Anyway, when will I start showing? Did anyone have this problem?