For the last 3month for few days after my period I have been getting pains in my lower abdamin and the inside of my vigina I have the constant feeling of needing the toilet and it stings when I go I have also been getting pains in the tops of my legs

Hello I have taken a contraceptive pill
And after that I am having my period which is lasting since 11 days
Generally I have a period of max 4 days ?

What should I do ?