Miscarrying...again..

Ladies - I had my second beta today and it’s dropping which means I’m losing this pregnancy. This makes two early losses in the last 4 transfers. I’m absolutely crushed. I’m meeting with my doc this week to talk about next steps. We have two embryos frozen and untested. I’ve done an RLP and came back negative. I’ve only done fresh transfers. Before we try our luck at transferring our last two embryos, what should I make sure my doctor checks? Hysteroscopy? Any other blood tests I should be doing? I’m terrified to do another transfer until we test everything we possibly can. I’m also thinking we should send our two embryos away for testing. Thoughts?