I'm a 23 year old sexually active with my partner I had my periods for seven days like usual then 2 weeks later I had them again for 3 days but only really light then 3 or 4 days later I had a pinky brown discharge for 3 days then it stopped for a day n it came back n it was like a pinky Goldy brown colour but not discharge like it was a very light period I have had lower back pain n my abdominal has been a little sore not much n my boobs r also a bit sore any suggestions on what could be wrong please help