You should try to treat your fever from home with Tylenol (may be taken every 4 hours) or Ibuprofen (may be taken every 6 hours) these can be taken at the same time. If your fever will not go down after taking these you should go in. If you have other bad symptoms (i.e.severe pain)- hard to give advice without knowing exactly what symptoms you should consider going in then.
If you were to call the emergency room, they would tell you to come in once your fever reaches 105. Technically you don't have a fever until you are over 101, so you just entered the fever range. Personally, I would consider going in if you reach 103 or more.