Oh wow. I haven't heard of this before. Sorry I couldn't be of more help. Hopefully someone will have some input to put your mind at ease. I know it has to be scary. Especially if there is an epidemic going on.
Proud Mom to Kaleigh (14yr) Emma (12yr) and Hanna (7yr)
That is kinda scary. But you know you're OK at 13 weeks. The 16 week mark is just around the corner. I guess it's pretty hard to avoid the crowds in Tokyo. You might consider wearing a mask and gloves (and maybe shades) while in public if it's socially acceptable? It's a tough spot to be in!
That is scary! I was also not immune despite being vaxed on schedule as a kid. I didn't even know until after my eldest was born. I think they gave me the booster in the hospital. It wasn't an issue here b/c we don't have an outbreak. Scary to actually be somewhere with a risk! I hope you can dodge the germs.
Re: Low rubella immunity