Do blood testing of your own will be fine. I had done it before because I was living in the UK a few years ago and had a dog at home during that period. My result was borderline. That means I might have caught that disease before but not totally affected by it. Since the disease would only be caught by dog's or cat's poo poo, my husband was responsible to handle my dog's poo poo during my pregnancy period. Anyway, don't worry about it too much, cos this disease is not commonly found in HK (according to my doctor).