It could be low blood sugar from m/s. Are you noticing headaches or had a migraine?

Does it get better if you eat something or drink something like flat lemonade (good way to boost your blood sugar). I don't know if dehydration can cause it, but check how much you're drinking and keeping down.

I don't think it's nothing, so go to ED if it gets worse or worrying. Can you call your OB office to ask (don't know if they're open Saturday). I wouldn't wait until Thursday.