Oh, I also wanted to add that when I was TTC, I was taking 100mg of B6 and 100mcg of B12, not for fear of miscarriage but because I wanted to get the best benefits of B6 since I had such a LPD. When I got pregnant, I stopped the B12 altogether. In talking to the doctor, she recommended the B6 only if I wanted to help curb m/s, with no mention whatsoever of B12. I'll be 11 weeks pregnant tomorrow, with no complications so far.
I'm just trying to calm you, and I hope it's working.