I have a headache for 3 days, sore throat, blood in my mucus, I had the chills 2 days ago but there gone do I have the flu?

See your doctor. Problems like these can only be correctly handled by your doctor in person. He/she needs to listen to you, perform an examination and possibly run labs or other tests. That's the only way he/she can find out what's going on and what to do about it.