Well done for not taking it any further.
What is
your definition of a fall?
What was your intention?
If it was nothing more than a moment where you weren't thinking clearly and yet you managed to catch youself when it went a little too far, then no, I don't think it's a fall.
I posted this on another thread a few days ago:
The Yetzer Hora sometimes works like binoculars. At first, it’s like looking at the deed through the wrong end of the binoculars - "That tiny thing, oh it's nothing, you can do that and it won't harm you".
Then, as soon as you do it, the binoculars get flipped around and suddenly the deed is magnified - "What a terrible thing you just did! You're such a bad person!"
That's one sure way of seeing that you were set up. In reality, it was a very small thing, but afterwards, it became very big...
Okay, so testing your filter is not really "very small", but you handled it well.
Learn from it and keep on trucking...