Heartbroken! Scan this morning fine, scan later nothing!

Ive suffered a misscarriage today. I cant tell tell you the loss I feel right now. I started bleeding on Monday when I left work and went straight to A and E. Had a scan all OK. Went home relived. I was still spotting brown but was told it was normal.Last night I bled red blood. I called EPU and they told me to come in. I had a scan this morning and took my daughter with me as husbmad was in a meeting, she is only nearly 3 so doesnt understand, Any way the sonographer told me that I was 7 weeks and baby has a heartbeat and all OK. I was estatic. She told me it was probably breakthrough bleeding. Anyway I get home and im bleeding heavily, but felt daft ringing again and baby was fine. I went to the toilet and passed a clot. I called EPU and they told me it was probably a build up of blood around the uterous. She said come in if it eases your mind but everything is fine. I called husband and he came with me. We sat in scan room and I felt a little daft as the scan woman gave me a funny look to say "why is she here again". When i was being scanned I could tell something was wrong by the time it was taking. She said im so sorry but there is nothing there anymore, I said but it was this morning!! She said sometimes they just cant tell.
Im absolutely devestated, I had all this year planned and was looking forward to my Xmas baby. My little girl keeps asking why mummy is crying and I dont know what to say??