3 input hbridge motor control.

Im trying to make a mini RC car using an Attiny85, im going to be using an hbridge for the motor control. The problem that i have is that i only have 3 available pins to use for the motor control since 2 of the available 5 pins are being used by a bluetooth module. My question is if there is anyway to control an hbridge to go backward, forward, left and right, but do using only three input pins. Thank you in advance.

No. You could do backward and forward OR LEFT and RIGHT but not both.
Why ?
What chip are you using for the H-Bridge ?
Think about it. . You have 4 DIR controls and two SPEED (PWM).
if you only used full speed and stop you would still and 4 DIR pins.
LEFT WHEEL MOTOR
IN1
IN2
ENA

RIGHT WHEEL MOTOR
IN3
IN4
ENB

FORWARD REVERSE
IN1 = HIGH LOW
IN2= LOW HIGH

IN3 = LOW HIGH
IN4 = HIGH LOW

LEFT TURN = LEFT MOTOR REVERSE,RIGHT MOTOR FORWARD
RIGHT TURN = LEFT MOTOR FORWARD, RIGHT MOTOR REVERSE

CAN YOU DO THE ABOVE WITH THREE PINS (WE HAVEN’T EVEN TALKED ABOUT SPEED CONTROL)
This actually depends on how you connect the motor but the implication is that the shaft point in opposite directions
one pointing to the left , which turns CCW to go forward, CW for reverse.
one shaft pointing to the right , which turns CW to go foward and CCW for reverse.
Consequently the logic state for left motor must be the mirror (inverse) of that for the right motor.