A lot of western doctors will recommend to stop tcm when you are pregnant, as you would already be taking western supplemts like folic acid etc. If you still want to continue, please take them 2 hours apart. That said for An Tai Yao, I have friends who continued to take it in the first trimester. I suggest to bring this up to both your tcm practitioner and your western obgyn so they can ensure you are not over supplementing your body. Congrats on the pregnancy