Take an epsom salt bath. You can get a scented variety too for the aroma therapy. The magnesium in epsom salt is amazingly beneficial for pregnant women and it relaxes achy muscles. Just DONT ingest it. :)
I take baths a couple times a week. No problem unless your mucus plug is gone. Don't get the water too hot though, I think that is the main concern. Increase in body temperature is said to be harmful for the baby.
I take bubble baths all the time :) as long as you havent lost your mucous plug
I used to take baths with my last pregnancy but I didn't use bubbles. The only reason I haven't this time is because we moved and I don't like the tub here. I think you will be fine. :)