Botght a car while husband was away it was a really bad deal can i take it back?

The car hasnt been financed yet its been 2 months since i was gona make the down payment in payments now my husband got back and was oh so pissed off on the payments the interest rate etc well the dealer is ready to get the ball rollin and try to get the loan they even instructed me to tell the bank when they call that i make more than what i stated question is can i take it back and how do i go about doing so im in california it was a really bad deal i signed a contract i dont know if that meant anything.