Is it normal for my baby bump to seem smaller?

I’m 16 weeks day 1 and it seems that my baby bump is smaller than usual. It also seems that my stomach isn’t as firm. Is this normal? I’m a bit concerned about it but the good thing is I see my doctor next Monday.

She says that the warning signs are severe cramps and bleeding but all of this is new to me. So I’m not sure if what I mentioned at the beginning is normal or not.