has anyone been trying to get pregnant and is kind of sad cuz its taking forever to get get there?

im 23, married and we have a 3 year old son so weve decided its time to try for another but i was on the pill and also had the implant in the arm for awhile once i stopped using both birth controls we took it slow so my system could go back to normal before trying to have a baby. So weve been trying for 3 months and i take tests like crazy and still nothing so im getting close to giving up cause i hear stories of girls that get pregnant almost right away after coming off birth control but since its the opposite with me its frustrating cause i dont know why :(