I had my period January 16th-20th. my periods have been consistent. Then bleeding started again on the 31st, it's the 3rd and it's very light and a light pink just like when it started. Seems like it is stopping. It turned red on the second day of bleeding and was a bit heavy with tiny clots. I've have nausea, slight one sided cramps, moodiness, back pain, headaches, and have been constantly tired but nothing to severe. Any ideas of what it could be?