2 1/2 yrs post-op & 5wks Pregnant

just found out I am 5 weeks along, I wont be able to see a OB for another 3 weeks, is there vitamin wise that i need to change aside from my regular vitamin routine?  I have tried to research RNY and pregnancy and all I find is cutting out any and all food with Aspertaime as it can cause miscarriage and birth defects, which means I have stopped all sugar free foods and drinks, including crystal light since it also contains Aspertaime.  But other than is there anything I need to change, Protein? Adding or getting rid of Vitamins??  Any advice until I can get into my Dr would be greatly appreciated

Thanks

I didn't have to change my vitamin routine as my chewables had adequate folic acid.  My ob said to up my calories about 300 a day, i don't count calories but did add an additional healthy snack.  I continued with my daily protein shake/bar.

They told me not to change anything.  The only thing I did add was an iron supplement.  They can test your vitamin levels when you go in.