Belly size

Hello. Probably a silly question, but is anyone feel smaller this go round? I’m on my 4th pregnancy. I have 2 boys, had a mc and am currently 18 weeks. It’s been 5 years since my youngest son was born. I just feel smaller belly wise, but have noticed I am getting bigger all the way around this time. I sometimes feel I’m just being a nervous nelly, but I am so excited to be having another baby.