What Causes Pain In Uterus And Stomach?

Dear DR. I am ambika study in dehradun but basically 4rm other state.i am 20 year old ..when i was 14 m sufring 4rm period..from the 1st attemptation of my period iam suffering 4rm the sharp pain on my stomach mostly on 1st 5 days of period..and some time my date of period comes in 20 or 25 days.

In this year of ferbuary i lost my verginety and start facing new problem.my utrius paining lot of time in normal days and stomach.when im sufrin 4rm toilet then my utrius sufrin 4rm pain and after toilet there is small interval of relaxation time.bt pain remains..now in these days m sufrin 4rm again period today my 4th day n im sufring 4rm lots of pain in my stomach n utrus.n d pain of stomach is just down of the stomach and up to the utrus..means betwen the..;-

please Dr. Help me