Just remembered, we bought this Babyliss bubble jet years ago when I was pregnant with my first as I had a really bad back towards the end of my pregnancy -
https://www.amazon.co.uk/BaByliss-8059U-Quiet-Bubble-Jet/dp/B0000YVFZK
Well I only just googled in several reviews you're not really meant to use it! Don't remember anything in the instructions about it at the time. To be honest I don't see why it's a problem, the bubbles were going onto my back only as you put it at the bottom of the bath, plus you can have different settings for the strength of the bubbles. And it definitely helped relieve my back ache.
Does anyone else use this while they are expecting as I was thinking of getting it out and using it again as my bump is getting too big for my dates and I'm suffering again with back ache??