D.W.
I would call now.
If you have vomiting and diarrhea they are NOT going to want you in the office. You have no way of knowing if it's food poisoning or a nasty tummy bug and the last thing they would want is that spread to their office. She/he will probably tell you to head to labor and delivery to be monitored and given fluids so you don't dehydrate and start contracting.