What's wrong with me?, I'M SCARED!!?

I HAVEN'T GOT MY PMS FOR FOUR MONTHS AND I BEEN HAVING UAL WITH MY BOYFRIEND AND THE OTHER DAY I HAD BLOOD WHEN I WENT TO USE THE RESTROOM BUT NOT BLOOD IN THE URINE JUST THE PAPER, FINALLY IVE ALSO HAD PAIN AT THE LOWER PART OF MY STOMACH, IT BE HURTING ON BOTH SIDES RIGHT AND LEFT SIDE AND I JUST DONT KNOW WHAT'S WRONG WITH ME IM SCARED!!!OH YEAH AND LATELY WHEN I USE THE RESTROOM AND PEE IT HURTS, WELL IT DOEST HURT WHEN I PEE BUT WHEN I PEE THE LAST DROPS IT FEELS WEIRD