I Mentruate Regularly,3 To 4 Days In A Month,in The

I mentruate regularly,3 to 4 days in a month,in the 4th day the blood coming out is just a tiny drop,i felt cramps like others,but this month i have my menstrual flow for 4 days and it was just like i had at my 1st day,the blood are thick and i felt so heavy cramps and back pain