Personally, if it were me (the paranoid easily freaked out gal) I would call and get in sooner. I am sure you will probably be fine otherwise, but what can it hurt?? If I am sick or having some particular problem my Dr always has me come in the same or following day (heart related or otherwise).
Personally, I couldnt stand to have my pulse at 178. I would want answers and a solution asap if for nothing else, comfort and peace of mind
Good luck to you!!