3rd day into invisalign first tray and 2 of my bottom right teeth furthest to the back won't stick

Is it normal to be in the 3rd day of my first trays and the back 2 teeth on the bottom right of my mouth are not sticking properly to the invisalign? I feel myself constantly using the chewies and crunching down on the invisalign to try and make it stay but still nothing. Yesterday I made an appointment with my dentist for tomorrow but then I cancelled it today as it felt like it was sticking down all day. Then it was dinner time, I took my invisalign off and now it won't stick! Please help

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