My baby growth is slowing down

Hagen

I had an appt at 33 weeks and 3 days and was measuring 33 1/2. She said he was measuring a little behind, but not too much to be a concern. Now, at my 35 weeks and 3 days appt I’m measuring 34 1/2. She said it could be because I have a small frame, but he was always right on track every other time. Did this happen with anyone else and if so what did your OB say and did it affect your pregnancy?