Very common. Some report that it took about a year before their hearts settled down to something closer to their pre-diagnosis HR.
What you don't want it doing is to stay above 100 for more than a day or two at most. If that happens, see your EP or go to Emerg. When a heart acts up after an ablation, there are three possible remedies: low dose of metoprolol or equivalent for a few weeks, then wean off over about 7-14 days; another anti-arrhythmic such as Flecainide or Sotolol, propafenone on a light dose for two-four weeks; or simply a cardioversion at the ER. My own team told me that if I went into flutter or AF and it wouldn't convert after a few hours to go get cardioverted.
Always consult an expert before trying something new or in desperation.