Re: Miscarriage but..
I too had a miscarriage at 14 weeks, but it was handled very differently. I was given an ultrasound scan just before the miscarriage was complete to establish that the baby had died. Then the morning after the miscarriage scanned again to make sure the uterus was empty. The products (placenta, baby etc) are also sent away to look for signs of - what went wrong. Thats a simplistic version of events, buts its just to outline what happened to me. That said I lost the baby in the hospital and not at home, I guess that if it was at the 14 week mark you will have had an actual fetus/baby and not simply an extra heavy period style miscarriage. Again this depends if the fetus developed up until this point, as some women have a blighted ovum (sac and no baby) or the fetus dies weeks before but is not expelled until many weeks later, hence no baby to be seen.
As for the cramps/movement you describe, that may have been simply wind, or as you suggest a pregnancy. I think you should deff go and visit with your GP.
I also wanted to add that I lost my baby on the 28th Oct 03 and I like you felt still pregnant, the symptoms did not really go away, I still felt sick and nauseous. I did a home pregnancy test the following month around the 26th Nov 03 as I was so convinced that I was pregnant. It was positive. I called the hospital and they immediately said that I most likely was not pregnant (as there was no chance of a twin prego) and that I may have a slight bit of retained placenta. This would kid my body into thinking that I was still prego, hence the symptoms. They scheduled me for another ultrasound scan prior to performing a D&C. Well much to everyones surprise there was another fetal sack with the very beginnings of a petal pole (heart beat). I had concieved within days of losing my baby. I had a gorgeous healthy little baby boy in July04.
So what I am saying is make sure you take your folic acid! Right after a miscarriage I was told that my next cycle should come within the next 4 - 8 weeks, your hormone levels can be a little scew wiff, so perhaps that why you have not gotten your period just yet.
Alternatively like me you may be prego again.
Do let us know ho wyou get along, thinking of you, and sorry for your loss.