Do you trust your pill?

Emily
I've been on the pill for three months, and I've recently started having unprotected sex with my boyfriend... No matter how much data or reassurance I find, I'm so paranoid about getting pregnant! If I'm not on my period, I'm just a walking ball of anxiety. I definitely do not want a child right now. 
Do you trust your pill? Do you know anyone who has gotten pregnant while on the pill or have you experienced it yourself?