I'm sorry you are worried about the viability of your pregnancy.
Temps can fluctuate during pregnancy just as they do during a normal charting cycle. This is the main reason we tell girls to stop temping after they've received their BFP, because it can often cause stress at a time when you want to be as stress-free as possible.
I sincerely hope your numbers start to beef up and that you receive some reassuring news very soon.
Definitely KUP...