It is a PNY brand 16GB mini SD card. Available space right now is 8.89 GB's. I believe I ordered the card the same time I ordered the phone.
When I unmounted and took the card out, it didn't show anything under SD card in the storage page, which should be right. I put it back in and it shows total space on card as 14.91 GB, available space 8.89 GB.
I have never had a notification about it being unmounted. I will try and delete about half of my pictures and see if that makes a difference.
EDIT ----- I downloaded h2testw and it told me I had 46Kbyte corrupted.
It said it had 15263Kbytes, which equals 14.9GB. Size looks right, must be the corrupted files causing the problem.
I let windows fix problems with the card and after fixing the corrupted files it does look as though the card is almost full. For some reason the corrupted 46Kbytes of files were making the card look only a little over half full.
Thanks for a the help guys, and thanks lotus49 for suggesting I run the h2testw program.