Measuring small?

Kait
Last visit I was told I was measuring small...so they sent me for a ultrasound. She said baby weight is over 4lbs. The Internet said it's normal weight at 33 weeks she didn't say anything about fluid being low ...but baby was Def really head down and low she had to scan below my underware line to get mesurments of the head. I just understand my boyfriend said it looked like it said the baby was a week ahead but when they measure my belly they think I'm small...Baby looked healthy thankfully I didn't get a call from my dr so I think that means nothing bad. I do get why I measured small but baby's the size it should be for this stage unless I'm wrong.