I recently came on my period about three days ago. I have always had irregular periods,but lately this year my periods have been coming on more frequently. I had a very painful cramp before my period started,then a day after that severe cramp,my period started, first it was very light red blood,then very black blood with clots,and now it s dark red blood. I have never been pregnant,I am 30 yrs.old....is it possible that I had a miscarriage? And my breasts are very sore and tender like never before....