ADVICE ANYONE?!?

how long do you try before seeking medical advice. i have one child, my little boy he's just turned 4. 😊 i had this plan in my mind that i wanted to be half way through with another baby by now but it just isnt going my way. my next period isnt due till 23rd but i just dont feel any different and ive been following the app for some time now. just feel like im putting to much preasure on myself and its getting me down.