😭I'm at a loss 3 yrs 😭

I'm seriously at a loss. I don't know what to do anymore. We have been trying/not trying for 3 years now with no luck. I'm becoming more and more depressed as it goes on. I'm almost just completely done with trying to have a child of our own. I'm devastated. It seems like everytime I get excited bc im late just to be let down the next day bc AF has decided to show again. We have been to the dr. We can't afford fertility treatments so that's out of the question. I'm just at a loss and don't know what else to do. I feel like I'm letting my poor husband down bc he wants a little one so bad and I just can't make it happen. My heart hurts so bad. I'm ready for a family, but apparently my uterus is not. Im lost.... idk what to do anymore. 😭😭😭😭😭😭 I feel like I'm failing as a wife.