birth control

So im 17 i have a lot of sex with my boyfriend that ive had for the past 2 yrs and we usually dont use a condom bc im on the pill. But he also pulls out everytime. Its my like 6 month on this new pill and i finished my sugar pills anout a week and a half ago and i didnt get my period at all. The first 2 months went perfect but then after tht i just spot out of nowhere and stuff. And the oast few times ive been getting dark brown thick mucus. Is this bad or normal?