Baby Weight

Alyssa • 28. Single Mother of Two.
Had an ultrasound last week for growth and development because of some health problems I've been going through. The ultrasound technician said he was measuring just under 1.5lbs. We asked if that was where he was supposed to be and were told yes, but everything I've seen says he should be around 2lbs. Should we be worried? Did anyone else have this?