How long is it accurate

Nicole • Cajun girl, foodie, world traveler, craft addict, romance novel hoarder = me in 10 words or less!😁
So, some times I'm extremely regular on my periods (like 3-4 months right when glow says to the day). Then some times I'll go 2 cycles that are longer apart - like 5 or 6 weeks apart. Well, my last period ended Dec 22 so when this happens I'll usually run get a pee stick just to see. Af always shows up so its not like I think I'm really pregnant but here's my question: I pee, I wait a few minutes, I look and solid nothing- definitely no wiggle room. Someone at work saw it and questions me an hour later (in a loving way) so I grab it to show and it looks the exact same. Fast forward about 5 hrs and I'm peeing again and I glance down and the stick catches my attention bc there is the faintest line in the pregnancy direction. I'm still pretty sure I'm not pregnant (because I've been with the same man for 11 years and off birth control for at least 7 so... Pretty much accepted it's not happening, plus he's not interested in really trying anyway) 
Any help you ladies can offer would be appreciated!