if you were 3 weeks pregnant, that was one week post conception, i think, and possibly even pre implantation.
i don't think the neural development occurs so early
termination is an extreme reaction ,
i would suggest you speak to a gp as soon as and get a referral for some proper advice
there are all sorts of things that can create problems in pregnancy.
and some are preventable, and some are just bad bad luck
have you been taking folic acid and preparing oyurself for pregnancy? was it planned?
it seems like an extreme reaction to me, but that's my opinion,
you must seek a referral for unbiased and accuraet advice re FAS adn terminatkion