Hi. I am 26, and have had a regular 25 day cycle since age 17 with onset at age 12. My boyfriend and I became sexualy active 6 months ago, neither of us has previous partners. We had protected sex on March 28. I had my period April 1-5. Continuing since last wed I have been spotting. Mostly rust color, but sometimes the toilet paper is pink. I am not on birth control. And am not expericing any crapping, back pain or tenderness.