From last month my mensuration cycle is not normal i'm getting only 2days period cycle??? but i have also checked i'm pregnent or not!! but my result was negative than what should i do to make my period cycle 5days or 4days ....?

If you are using some form of birth control like a birth control pill or an IUD it may cause the cycles to be very light. Otherwise it may simply be how your body is functioning right now especially if you tend to be thin or have lost weight. There is not anything specifically to increase the average length of a cycle unless you were on birth control, in that case changing Birth control my help