Should i continue kickboxing with slight knee pain?

i have tendonitis in my knee and every once in awhile i get a slight dull pain in the knee. I do kickboxing however and i wear a knee brace and up til now it hasn't cause me major pain i still have that dual pain after training and i want to know if i'm basicly making it worse by continue to train...i always ice my knee and do strectches and it makes it feel slightly better...advice would be greatly apperciated