Should I be worried ?

I am 27w3d. Before pregnancy, I was told I was anemic but I haven’t gotten the bloodwork repeated recently. I asked my OB if it was safe to take my iron still but he told me that my prenatal should cover it. The past two days especially, I notice that I feel dizzy a lot, which Glow says is normal. But it’s like any time I move around too much, too fast, or (weirdly enough) tired or stressed, I get lightheaded. Like earlier, I was stressed bc I was having a Braxton hicks so I was trying to flip (I sleep on my stomach) and I felt really lightheaded. I had to close my eyes to calm it. Also baby has been less active since that started.