Ultrasound Question;

Mirian • Momma of 2 beautiful boys (9&5) currently pregnant w/ baby #3
So I'm 32 weeks & 2 days today & last week I had my prenatal apointment which was when my doctor told me I was measuring small. So today at my ultrasound the technician said that my baby was in the 27th percentile of length & that the amniotic fluid was a little low (normal low) she said that everything looked good & that I just needed to drink more liquids. Has anyone else had anything like this told to them? I don't remember ever being told this with my first son so it made me kind of worried & I don't see my doctor till the 5th.