Bleeding after 7-8 days of taking ipill.

I had sex with my partner on last thursday, friday & saturday. I took an ipill after friday. From thursday night i am feeling a lower back pain. Few days after taking the ipill there were traces of blood. I even had a lot of problem while urinating. From past 3-4 days the rate of blood shade has increased along wd mh lower back pain & mh lower stomach pain. I am tensed because i think may be some of my internal parts are damaged or rather effected due to consumption of ipill. I am very tensed. Today is the 9th day & still i am having blood shed! Cloths of blood are falling jst like on the 5th day of periods! I am really very tensed what to do & what not to. I would be highly obliged if you can answer me all my questions.