2yr old with a fever

So he started to feel sick this morning. I took him to his pediatrician and she said to alternate between Tylenol and ibuprofen(she gave me directions on how to do it).

I just checked his temp and it's 102.8. I called our er to ask when I should bring him in and they told me if I was concerned to just bring him in.

What's a dangerous level for a 2yr olds fever to be? Its been down all day and this is thw highest its been.

TIA

**he does have the flu and yes I know it is viral. I'm just looking to get his temp down.