You can't get pregnant unless your ovulating.
My first time getting pregnant was 1 random day of having sex with no protection. Now i'm working on my 2nd child and i've been trying for 6 months getting pregnant, and i'm still not pregnant, because you can only ovuluate about a couple days a month, and I happen to not have sex those days UNKNOWINGLY. Too lazy to buy ovulating testing kits...
My first time getting pregnant was 1 random day of having sex with no protection. Now i'm working on my 2nd child and i've been trying for 6 months getting pregnant, and i'm still not pregnant, because you can only ovuluate about a couple days a month, and I happen to not have sex those days UNKNOWINGLY. Too lazy to buy ovulating testing kits...