fundal heigh measurement

So I've seen a bunch of midwives through this pregnancy, and at my 31.5 & 33.5 week appointments I had the same midwife student and to say the least she didn't really go over much with me. But at my 31.5 week appointment I was measuring 30 weeks, then at my 33.5 week appointment I was still measuring 30 weeks. Should I be concerned that it hadn't changed???