Keto sticks messing with my head

Okay so I am freaking losing my mind. I'm almost 2 weeks into keto, and I've been staying at about 20-25g carbs max daily. I've been working out, lifting, sprinting etc.

Well we have had to eat out 3 times on this diet. The first time messed me up and put me at 34g carbs for the day because they had hidden carbs in their cheese sauce. So I learn from my mistake right? We were just out of town and I had to eat out. This time I made sure to look up nutrition info of the foods I wanted to order so I couldn't get messed up this time. I get home, and behold; when I returned my keto sticks said I had NO ketones. I am piiiiisssed. I've been depriving myself of everything I want just to be in ketosis and what do I get? A fucking negative result. Two days previous, before I had left for our trip, I had moderate ketones.

Now I know that keto sticks aren't always accurate. But I have literally no other way to know if I'm in ketosis. I don't get keto flu, I don't get any symptoms either way, so I don't have any clue if anything needs to be adjusted. The only thing that could be culprit is sugar free stuff. I always check for carbs even in diet sodas and things, but I've had more sweeteners while I was away. Could this be it? Or should I not care what keto sticks say?