Swimming in the ocean after miscarriage ?

I started naturally miscarrying two days ago. The ultrasound today showed I passed the baby and gestational sac but my lining is still thick. Anyways, still cramping and bleeding so things should resolve on its own. My husband and I are traveling to French Polynesia in 9 days and I was wondering what have your doctors told you about swimming in the ocean?? Mine said don’t do it until hcg is zero but she is afraid of infections and never swims in the ocean herself! I think it is a bit too much. She also didn’t wanted me travel long anywhere during my pregnancy for no reason, I was not high risk. What are your experiences and opinions? Thank you!