TTC baby number #1

Hey ladies, so I'm 22 and me and my partner (23) have decided to start trying for a baby. We have been together for 2.5years, but this is something we have always spoken about. I've been off birth control for a year, just used condoms. We are now not using anything, im noting my periods, going to start using opk's, I'm just wondering how long it took people to actually conceive once they started trying?