Dizzy to the point of falling

So I wanted to get some opinions because i’m not going to lie, i’m a little frazzled. Today while I was out grabbing the last few things for the nursery I had a dizzy spell so strong I almost passed out and fell down, but the cart caught me. I felt my calves a little bit ago and they are so tight they feel like they’ve both got tennis balls attached. I still feel a little light headed and a little headachy, but i’m not dizzy anymore.

This is after I climbed some stairs today, but nothing super crazy. 28w+6 days along. Should I be worried?