Transferring 2 poorly graded embryos

Hey all!

Has anyone transferred two poorly graded embryos and wound up pregnant? I’m 34 and have one healthy 21 month old boy from a fresh transfer. Our last frozen embryo (graded 4AB, same as my son) ended in a chemical pregnancy. We only have two poorly graded embryos left - 2AB and a 1 BB and our doctor is recommending we transfer both. I just can’t help but feel super discouraged so I’m hoping to hear some success stories! Thanks!