Too many BFNs

There is a support message board that I have been a member of for nearly 4 yrs now. This past month has seen too many BFNs from ladies who have one child from a fresh cycle and were doing a FET in order to get a sibling. I am not only sad for them but also for myself. This just makes me more sure that my cycle will end in a BFN. I've also noticed that the few ladies who have gotten BFPs are ones who already have twins. I guess it makes sense, the twin moms obviliously had better quality embies to start with since they got twins. Guess it just makes sense that their frozens would be better quality also. While I'm so thankful that I was able to get preggy with Lydia, it still makes me sad that the other embie that we transferred with her didn't make it. If none of these next embies make it, that will be 15 embies that we created that didn't make it. I worry if they are in Heaven or not. I pray they are. It makes me so jealous that those with twins are able to get preggy again, while so many of the ladies with just one child are getting BFNs. I'm sorry, I know this sounds very selfish, especially for those who are still struggling to have a child. I'm not sad for myself, but for my dd. I worry so much about her not having a sib. I worry that she's going to feel like something is wrong with her because we had to use DE to have her, guess I feel that if she had a sibling the DE thing wouldn't be such a concern. Maybe it would be, who knows? I think Lupron is making me much more emotional, I've done 3 shots and have had a bad headache for two days now. Plus my back is killing me. We went to the zoo yesterday and all the walking around has done my back in, I feel so old sometimes, it sucks!!!!