Could my lingering cough from a cold cause blood after coughing?

I had a cold last week (nasal congestion, sneezing, sore throat). All of those symptoms seem to have cleared but I have a lingering cough. It's not really "productive" at this point & is worse in the mornings. I also have had sinus pressure & drainage on & off for a few weeks now. This morning while coughing there was just a little bit of blood. I haven't seen it before & it only happened once. Afterwards my chest & throat were also a little sore but are much better now. I'm not having any other symptoms & no longer feel "sick." Could the blood just be produced from excessive coughing? Should i be concerned?

If I notice it again I will definitely consult a physician but I couldn't help but worry just a little bit. Everything I keep finding online seems to be people who have been coughing up blood for days or are coughing up large amounts of blood so I haven't seen much from others with similar experiences.