How often can i take a bubble bath? I'm 25 weeks pregnant?

I took a bubble bath last wednesday cuz i was having a lot of back pain and PAINFULL baxton hicks contractions and after the bath I felt really good and relaxed I was able to sleep for 6 hours. I was wondering if today would be too soon to take another bubble bath since we're not supposed to take so many bubble baths while pregnant. im in a lot of pain and need to realx.