Prego?!

So I am regular on my periods but this month I am 12 days late!! I have taken 3 tests and all came back negative. 😭 could I still be pregnant? I have no changes or added stress in my life. Should I call my doctor?

Oh and to add to the weirdness.... my stepdaughter who is 5 told her mom she was getting a baby brother at our house. Now clue where that came from. 🤷🏼‍♀️