why cant i get pregnant😭

Took me 4 years to get pregnant on my son and its taking me another 2 years and 1 month so far to get another, whilst im seeing girls on their 5th child, i know its not a competition and i KNOW i am lucky to have my son i have now and i really know i am. Im worried something's wrong with me, i have regular periods and ive lost alot of weight, i eat healthy everyday other than one cheat day, my stomach constanrlt painful, i ache when im ovulating and excruciating pain when im on my period, i havent been to the doctors because i just feel like they wont do anything, i just want another baby😭