Good Luck Willow, keeping everything crossed for you.
I know exactly what you are going through at the moment and I feel like I am going crazy. I am so tempted to go and buy a HPT. I have done a natural FET cycle so I know I don't need to worry about false results because of meds so it's very tempting.
My BT is on Monday (12 DPT) and I had awful cramping for most of yesterday so I was going to the loo every half an hour to check as well! Feeling much better today, no AF, no cramping and my temp is still high.
Normally I have a 26-28 day cycle and I am currently on day 31 and trying not to get my hopes up but stay positive at the same time. Not an easy task.