Positive test on or after AF?

Has anyone gotten plain negatives up until the day of or after AF is supposed to show and then gotten a positive? I’ll be 12DPO tomorrow and have had CLEAR negatives so far. I woke up this morning feeling like my period was going to start but then this afternoon rolled around and it’s like everything switched and I started feeling like I’ve been having pregnancy symptoms. Still having this gut feeling like I’m out. Any positive stories to share? Going to try to not test again until the expected day of AF (Friday).