I'm 10 weeks pregnant and have been consuming folic acid. Do I stop at my 12th week or 12+6 or should I continue?

Folic acid is recommended to be taken before conception (when planning for a baby) right up till 3 months after conception. If you have leftovers, it is of no harm to finish the supply as long as you stick to the instructions. I would stop at 12+6, just to be on the safe side. http://www.nhs.uk/conditions/pregnancy-and-baby/pages/vitamins-minerals-supplements-pregnant.aspx#close