Trying to concieve at 17.

Hey everyone! Im Gloria and i have a boyfriend that is 21. We got together 5 months ago and are deeply in love. In the beginning he started talking about getting me pregnant and so i started to think about it, and now he has convinced me. I do want a child..
We have never had sex with protection and im not on birth control, so its kind of weird that im not pregnant yet.. 
What do you think about this??