I belive in what you said too. I have a friend with the same case. Luckily, she's not pregnant yet, but she just wanted to play safe. After going to Japan, she went for body check BEFORE having baby, then the doctor told her she should not have baby at least after 3 years.
I understand that many people in HK have awfully strong passion for going to Japan. I'm not a big fan and more important the grave consequence of 核幅射洩漏 is not sth. you can feel in short term.
I don't mind taking the risk, but I'm not risking my kid......