Feeling off?

Today has been one of the worst this pregnancy. All day I’ve not felt good. Started with being shaky all over, and a small headache. I ate, thinking my sugar my have been low and I guess it helped because I took a short nap and felt better. When hubby got home we went grocery shopping and again I just felt bad. I started to feel dizzy and nauseous in the car. I don’t know how else to explain it but I just don’t feel right. I’m laying down now to see if it helps but I just feel sick. I’m 34+3 today and have never experienced this. Anyone else feel “off” before they went into labor or preterm labor?