Baby dropping ?😫

I was reading that when baby drops into your pelvis you will know because of lightening crotch & the feeling of being able to breathe again. Im 30 weeks tomorrow but still cant breathe its sooo uncomfortable how long will it take for baby to drop?? πŸ˜’πŸ˜’πŸ˜°πŸ˜°πŸ˜°πŸ˜”πŸ˜”πŸ˜”