Pill Help!!!

I'm 16 and I started the pill around 3 months ago. my first prescription pack seemed fine but my period did not come with the orange pills as I thought it was supposed to it came early and was SUPER light and short (3 days ish) . I assumed my body was just adjusting. the next prescription pack was even worse though, I started it the Sunday after the last period as I was supposed to and maybe 2 weeks in I got my period and it lasted for 2 whole weeks and was heavy and very dark/clotty (ew sorry!!) I stopped taking them thought for the next month to see what my body would do on its own. then I'm going to start it up again on the Sunday after my next period. thoughts????