Why is My Pregnancy Such a Surprise? P.C.O.S.

In March 2010, I was diagnosed with PCOS (Poly Cystic Ovarian Syndrome). I was devastated. I had ALWAYS wanted children, and was being told that if I was to try it, I'd have to get on medications and blah blah blah.
Well a year and a half later, and here I am: PREGNANT with NO help and while taking precautionary measures to NOT get pregnant! 

I was on the mini pill (birth control pill). This is a pill that you are to take everyday at the same exact time. And boy did I! I set my alarm to go off at 1:35am EVERY DAY, because I ALWAYS knew where I'd be after midnight.... in my bed.