Measuring behind 😔

Anne
Hi! I'm 34 + 1 and just got back from my midwife appointment. Last time (at 30 weeks)  the bump measured 1.5 cm ahead, which is ok I guess. But this time, bump measured only 33 cm 😔 My midwife dismissed my concerns that baby didn't grow much this past month. But it doesn't feel right, somehow. My fundus height only grew 1.5 cm in four weeks? Anyone else have a similar experience? What did your mw or Dr say? Should I be concerned? Should I call my gp or the hospital? She didn't even noticed that baby was measuring big last time but smallish this month until I pointed it out and she dismissed my concerns out of hand. Not sure what to think. What are your experiences?