It’s okay to toggle between left and right. Depending on baby’s position, it’s very normal to feel more comfortable on one side than the other... especially if baby’s kicking against your diaphragm or ribs. Don’t stress out too much:) prop yourself up with an extra pillow too to hopefully be able to breathe better
Both sides are ok! Choose what makes you feel better too, no point being too stressed cos that’ll stress out the baby too haha