Folic acid after Roux-en-y?

I can't get in to see my surgeon as they don't accept my new insurance :-/ 

I'm 3.5 years post op roux en y and almost 2 years post op belt lipectomy and abdominoplasty. We had a miscarriage in August 2014 with no real diagnosis as to why. We are about 5-6 weeks pregnant now and worried. 2 days ago we saw the yolk sac (nutrient sac) and the gestational sac, both IN the uterus (yay!) but no fetal pole or heartbeat yet. We're hoping to see that wiggling baby when we go back in 2 weeks. 

My question is this: I am one of the few that STILL malabsorb! How much folic acid do we need to take? Is it one of the ones that we only absorb a part of what we take? Any other vitamins that we need to "up" as preggo moms?