Can I lay on my back while taking a bath at 37 weeks?

I'm incredibly swollen, my pelvic area feels like I'm getting punched in the crotch anytime I move my legs and my back feels like it just snapped in half and the only thing holding it together is cheer willpower and scotch tape. Taking a bath has been my only relief but sitting in it isnt as helpful for my back as it still hurts so bad. Would it be okay to lay on my back while in the bath?