Ttc for 6 months with no luck

Shelby • I LOVE YOU TRISTAN BRAYDEN AND ISAAC!!
Me and my partner are 23 and 24 he has a son and I have two of my own. We have been using no condoms since September of last year and have not practice pulling out since April. We have yet to conceive and every month when my period comes it is the most saddest thing to me like ive failed. I use a <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> and im new to Glow to track my 29 day cycles and ovulations I dont know what else to do. Any advice?