37 weeks and baths...

I'm 37 weeks and 5 days and my back has been killing me the last 3 days. So I've been just soaking in the bath. This would be the 3rd day, but someone told me it's not good to take baths. So can I take another about an hour bath just to soak and relax or is it not a good idea. Again this would be the 3rd day in a row if I do.