I also keep flucuating between being right on and a few weeks behind, and this is with the same measurer. My midwife is not concerned at all, as she can feel that baby is in different positions in my pelvis. This last week I was 37 weeks and measuring 35 (same as the week before, or maybe even 1 cm less), baby is way down in my pelvis. And, I do not make small babies (my last was 10.5), so if it was a 6 lb babe (which I do not think it is!), i would probably be measuring smaller still. I do think it is good that your provider is aware and willing to investigate if the trend continues.
ETA: I have also made major diet changes in the past few month (switched to vegetarian, no eggs, very little dairy). Babies take what they need to grow, so as long as you are eating a balanced diet with enough calories and protein you are fine.
Thank you for your story! Makes me feel better. Also I'm glad that you've changed your diet as well and are not worried about it. I feel like as soon as I went off gluten/dairy the measurements started slowing down. Maybe because gluten and dairy were seriously all I ate everyday! It was a huge change for me. But I agree that the baby gets what they need! Thank you
Mariewalter- I get that bowling ball feeling sometimes too (not often but I've felt the need to waddle a few times) I guess it all depends on how baby is lying when you're getting measured.
I just really hope my next appt at 37 weeks there is definite growth.