birth control

I've been randomly spotting the past couple weeks and I'm supposed to start birth control the first Sunday I start my period but I'm so irregular. & I started birth control behind my moms back almost 3 months ago but it was the depo shot and I'm supposed to get it again December 2nd but I went ahead and took this first pill because I'm having sex and want to be protected. So I practically doubled my medicine. Am I still protected ?
This is my previous period in October