Is this normal?!

So I took a photo when I first found out I was pregnant, about 6 weeks ago, and I took one last night because my stomach gets solid at night and I can hardly breathe. Clearly I’m huge but I’m only a few months pregnant. I’ve had a baby before and there was no way I was even showing at this point last time. I’m scared I could be having twins or something, I’m probably just being dramatic but has anyone changed this much so quickly?