Hay, I'm so sorry you're going through this, that sounds really scary and heartbreaking. Honestly, this is something you really need to talk to your OB about ASAP kasi embryonic demise can be serious and every situation is different, lalo na kung ilang months na. Maraming factors na dapat tingnan ng doctor mo, so please don't wait, go see your OB right away para ma-check and ma-guide ka properly on what to do next.