If you've tested out your trigger, have you ever had the 2nd line go away, come back, then go away again?

My trigger shot was gone at 10dpts / 8dpo.

Yesterday, (12dpts / 10dpo) in the am there was nothing, but I took another test in the afternoon (yes, I know I'm crazy) and saw the 2nd line again. (def. a squinter though) DH confirmed this when he came home from work. So I was like, "Ok well let's see what happens tomorrow am."

But now there is no 2nd line again!

(Oh and I had been taking tests in the afternoon in the days prior as well, and none of those had anything on it.)

So...hence the question at the beginning. I hate this