The problem with spas and the bubbles is that the bubbles are made from air and if air gets inside your vagina, you could get an air embolism which can be deadly.

Air embolisms can cause permanent brain damage and even death to a pregnant woman and her baby.

Don't sit in a sauna or hot tub. The high heat raises your risk of miscarriage and birth defects.
Quotes from FamilyDr website.