BBT could be a sign?

I see a lot of people say if your bbt stays elevated for 15 dpo it could be an indication you’re pregnant but not always. I’m only 10 dpo and I only have an 11 day luteal phase, AF due tomorrow. I hope this is a sign, getting discouraged because I tested the last three days and not even the faintest second line. I know it’s still early but I’m just ready for tomorrow to be here so I can see if AF will come or not. Yes I missed three days because my dogs had me up at 430 tossing and turning so I didn’t think my bbt would be accurate so I skipped it.