Go get checked out. I am an EMT. What if you do pass out and no one is there to help you? Don't drive yourself have someone else drive you. Chances are you are just dehydrated, but what if something else is going on? Not worth the risk of passing out.
Yea I would say hydrate & go get checked out.
If you think you should go then do it can't hurt to get checked out!
Keep hydrated, your fluids could be low. How far along are you?