Fever and sleeping

My sweet girl has been fussy and sleepy all day. I kept telling my husband she felt warm but our forehead thermometer was reading 98.8. Before bath I decided to take it rectally and it read 101.4! She just started daycare last week and I’m hoping this is just a little daycare bug and nothing serious. I gave her some Tylenol and now she’s asleep. Should I wake her up every few hours to check her temperature or just let her sleep as long as she wants tonight?