For me, I tend to wait, mostly because the dr.'s can't do anything for me unless I am sick....one two IV antibiotics work for me so 1) I don't want to be on them too much. 2) they can't do anything else!!!!!!! I'm in the same boat right now, don't feel all the way normal, have had fevers, coughing, chest pain, etc... no blood though!!!!! And I was on meds in Feb. so I've been holding off, I just don't know, I know that if I were to start coughing up blood I would call (though I don't call everytime I do) Anyways, I think you know your body and if you feel like something is going on then yeah, nip it in the bud!!! that's what my feb. one was.