anyone have a good ending with bbt drop? so scared.

I know I am not supposed to be temping, but I have an Ava, which can worn and <a href="">track pregnancy</a> symptoms too. My temp has dropped A LOT over the last two days, and is very close to my coverline. I am well-aware of what this could mean, but we have had so many losses. Any stories of hope? I'm desperate. 
(No bleeding yet, btw, and I am 4 weeks today.)