You should not at all be embarrassed. Having a miscarriage is nothing to be ashamed of; it wasn’t your fault. I’ve written a few poems about miscarriage, three of them being these:
http://writingsforwinter.tumblr.com/post/42798049646/la-moitie-de-moi-est-absente
http://writingsforwinter.tumblr.com/post/41920394021/the-unborn-child
http://writingsforwinter.tumblr.com/post/41991397965/a-priest-walks-into-a-bar
And while they are not particularly happy poems, I hope they might give you a small bit of comfort, or at least let you know that you’re not alone. xo