constant periods on the pill

hey guys, im 15 ½ years old, and i think about 2 months ago i was put on the pill for sexual reasons and to have even periods.
the 1st month i started to get a bad smell which is constant and i dont like at all, and i have also had a browny discharge. when i had my periods it was like usual.
BUT 2nd time i got them i tryed to avoid it for a few days because i felt like skipping it and had read in the skrip my doctor gave me that it was alright to. well, i started to get a light period and it did not work to skip. i have had now a light and heavy on and off period, but there is ALWAYS some. its been since the start of the month, and still this very day, and is now getting more heavy den usual that ive had. i dont know what it is, im not realy scared but i cant stop thinking of what it is, i have been checked for STD's and i have nothing (but i have not had a blood test) and i have not seen a doctor for this either.
can someone who have had this problem please help me out, it is very fustrating for me.

thank you for your time reading this.
xOxOO