They’ll elevate the bed a bit
I thought you were ok lying on your back until third trimester xx
Most spas have a pregnancy version of treatments, either sitting up more or on your side for back treatments
You’re fine lying on your back at 18, I asked my midwife at my 16 week appt and she advised that the need to avoid it doesn’t come in until the start of the third trimester
They sometimes lift the couch up abit which will mean you’ll be okay x