Negative test, can I still be pregnant??

Hi I’m just very curious an I’m probably just over thinking. But I feel like I’m pregnant now it might be the research talking. I have been off birth control for the past 8 months. I have had a regular period for the past three months recently I have missed my period. I have noticed frequent head aches , food carvings ( for food I normally don’t eat], hot flashes, tender breast, mood swings [ really bad swings 😬 poor bf ] an peeing much more then usual. I took two test before my due period both negative and two after three days of missed period both negative. I have a doctors appointment coming up soon . Was wondering if I could still be pregnant ?

Thank you much appreciate