Apart from telling your 西醫, and make sure that you do not have fever (it is no good for the baby inside), I suggest you to see chinese doctor, I also go to 香港大學中醫藥中心 (because I'm more confident with their professor doctor and medicine) since before pregnant, it helps you to keep a strong body and in case you get cold or cough or whatever, the herbal tea is much safer and mild than 西藥. 15 weeks still needs lots of care and attention, be careful in taking medication...good luck and take care la!!