That you have an irregular heart beat and you should have it checked out.
When I went to The ER, I had a very fast and irregular heart beat and high blood pressure. Mine is from a hyper thyroid. You should find out why yours is not beating right.
Nothing.
Your pulse changes all the time, so if it is just a bit faster then that is no big deal. If there is a big difference or your pulse spikes for no reason then you should see a doctor. In that I mean, if you check your pulse and it is 70 and ten minutes later it's 120 and you did not do anything that would need to be looked into.