Glow or FF?

It’s my first cycle using FF, and at first the O predictions were the same for both (CD15). But on CD15, FF put O earlier on CD12, and pushed the due date earlier to yesterday, which would be a very short cycle (24 instead of my usual 27). Glow never changed O date. That makes me either 14 or 11 dpo. FF is urging me to test, but if Glow is right I would be disappointed with BFN right?

Also to make things more complicated I’m traveling from Friday (Glow’s due date, normal cycle of 27 days) for 2 weeks, I’d rather know before, but I’m also afraid to be disappointed. And I’m not sure about the privacy I’ll have for testing while traveling.

Any thoughts about who’s right and what I should do?

(And sorry not to use opk I find them too stressful)

UPDATE- thanks everyone! You convinced me to test and... it’s positive! I still can’t believe it! :)