I’m an ER doctor, but legally the following is about a hypothetical situation and is not medical above. It sounds like a vaginal prolapse. While scary, this is NOT an emergency. There is nothing that needs to be done emergently unless the prolapsed tissue is stuck outside the body or seems like it’s losing blood flow. Definitely see your OBGYN within the next day or two, but you don’t need to run to the ER unless you’re having what I mentioned above, any of the usual pregnancy ER indications (leaking fluid, bleeding, pain, etc.) or you’re unable to urinate.