Ask a Gynaecologist and Get Answers to Your OB/GYN Questions ASAP
This is likely just a variation in your cycle due to late or nonexistent ovulation for the month. If you are not at risk of std or on birth control it is nothing to worry about. The blood is not due to stress or worry. The cycle should become more normal as your next period starts.
Is it possible that you may have forgotten a tampon from your last period? You may be able to check for it.