Pregnant or not

I been off the birth control shot for about an year now and I been talking these pill for my anger and I wanna know dose it effect me from getting pregnant or dose it effect the sperm from getting to the egg. I started my period January 3 till January 10 and I have been having sex doggy style and when I'm on top and missionary and every single time I bleed and the bleeding last about 5 days or so. What dose that mean?