Help please trying to get pregnant

Hi everyone so this morning af showed her ugly face. I'm here crying as I type this. My DH already has a child, we've been ttc since January 2018 and nothing. We've done bbt, clomid for three cycles, checking cervical mucus etc. We've also changed up our bd routine so many times I have no idea what else to try. Please pray for me I want to become a mother so bad my heart hurts. I feel this empty hole in my chest at times. I watch my husband with my step daughter and I feel like I won't ever experience those things. I know it takes time more for some than others but if there's anyone who's gone through ttc for more than a year and ended up conceiving naturally could I maybe get some tips as well? If u did anything different that cycle what was it? We've been so relaxed these past two months not stressing or anything yet nothing has happened same as the months when I tried everything