Please send prayers and baby dust!

I'm really struggling with Christmas looming. I had 4 miscarriages in 2016 and literally see a new pregnancy announcement weekly. My identical twin is pregnant with her second. She's now had two healthy, textbook pregnancies while I now have four babies in heaven. It's making me feel like a failure as all my testing has been normal so most likely my eggs are not great. I'm trying Letrozole this month because I'm desperate. Please pray it works on the first try. I'm not sure how much more disappointment my heart can take. I just want to be a Mama more than anything in the world. Thanks for reading.