Problems conceiving.?

My husband and I have been trying for over 19 months to conceive our first child. I've never been on birth control and we count my days.. and have even had sex every day of the month but nothing is working. I thought about a possible contributor to why I'm not pregnant yet. I have to be at work incredibly early in the mornings so every day I drink an AMP energy drink... would that have something to do with it...other than that i keep a healthy diet and take prenatals.