I want a child please help

I really want a child, I'm 17 yet quite mature, I have a steady job and income and I'm at college. I have helped raise my younger brother who is now 7 and I am on birth control. For the last 5 months I've cried when I got my period because I think I'm pregnant then I'm not, I talk to my boyfriend about this a lot. 
I want to skip my pill some days to increase the chances however I know how wrong this is! Please help