Can i go to school with mono?

i got diagnosed with mono today, but i've had symptoms for 2 1/2 weeks. ive missed the last two days, but can i go to school? i didnt get blood work done, just the doctors word. she thought it wasnt necessary, because i faint at the sight of needles, but can't write me an excuse for school unless bloodwork is done. so im wondering if i can go to school? or if i should just go get blood work done to miss?