Adding bubbles can contribute to yeast infections ask your doctor though. A warm bath with lavender oil would probably be better.
I love taking warm lavender bubble baths at least once a week. Helps to unwind and relax! :)
You should I my have warm baths for half an hour so you don't bring your temp up too much but bubbles shouldn't be an issue
The only thing it might do is irritate the vagina since it's scented....I can't rememeber how long you can stay in the hot bath during pregnancy because it's been a while since my last pregnancy, but I do know that hot tubs are off limits...