not sure wether im going to misscarry?

[buff_fan]

ok its very confusing, basically i had a scan 2 1/2 weeks ago and was told i was approximately 5 weeks, went back yesterday to have it confirmed and find out if viable. gest sac was 5mm last time and 12mm this time(*average diameter) and the doc told me that there was no heartbeat and no little blob meaning there was a baby. she did an internal just to make sure as i hadnt drunk enough water(or it hadnt gotten to the bladder just yet). she told me that it had died at 6 weeks, now i would approximately be 7 1/2-8 weeks.(not sure as period was missed b4 concieved aswell). i really need some help and soem answers as im all new to this. can anybody help. what i really want to know is-
why is it taking so long to come out?? i havent had even 1 drop of blood??
why did it grow to 12mm in less then a week(from 5mm)??
is that possible/normal??
and someone told me(not a doctor or anything she said from experience as it happened to her) thats its possible im not far enough along and the size could mean multiples. there was only 1 yolk sac, is this possible??
Im only 16, will be 17 in april and while i know its young, i do love kids, (i wasnt trying!) and i would really like this one know that i've already concieved it. The idea of losing a child is horrible to me-im sure everyone in this section knows wat i mean. so anyone with information or who can help out is veyr much appreciated. i cant go to the doctor as they have no spots till thursday and im scared to go to the hospital in case they do a d and c and the baby is still alive and i kill it.

Edit- sorry about the bad spelling, i type too fast sometimes to keep up with my mind going a million miles, if you dont understand something then plz say so and ill try and fix it