I am 7 weeks pregnant-but had a small bleed this morning. I went for a scan and was told that the heartbeat is v v slow and at one point she thought there wasn't one. She said the baby won't survive. I have to go back in a week when they expect no heartbeat. The midwife explained that I could miscarry naturally between now and then. What do I need to do to prepare for this? My head is all over the place.