Frustrated but grateful

I'm 26 and my boyfriend is 28. We've been together for about 3 years now and haven't really been trying but having been preventing anything either. If I do get pregnant it'll be the first child for the both of us. I'm getting to the point to where I do want children now and I'm wondering why it hasn't happened yet, at the same time I'm a big believer that everything happens for a reason. I'm frustrated that it hasn't happened for us but I'm also grateful that it hasn't especially with how the world as it is now. I'm just venting on day 1 on this cycle. Maybe it'll happen for us one day if its meant to be..