Hi, I had a bad cold this Winter with a cough that was really phlegm-y, and I noticed some little streaks of blood, too. I freaked out, as you can imagine, and called the dr the next day. He said it was "normal" with a bad cough. Prescribed some codeine cough med & helped calm the cough. It's a good idea to get it checked with your dr, too, cause although a cough can cause this, so can many other things. You can call drs on the weekend, you know. They usually are on call or have someone on call. They know people get sick on weekends. Try a cough suppressant tonight, to see if it will calm it down. And sticking your finger back there, could you have sctratched it with your nail?