congratulations on your pregnancy.
you will be fine. i know we're not the same as cows and goats, but i've seen/heard of those hitting or even getting tangled up in the electric fence while pregnant and being just fine.. never heard tell of any pregnant livestock being affected by electric fencing.. if it won't hurt them (and think about this: if it hurt pregnant livestock, there would be warnings etc everywhere!) it is extremely unlikely that it would hurt you.
i am sorry for your car wreck and loss. it's hard to relax when you're pregnant after a previous loss, i know from experience. i feel like i spent lots of time worrying about everything. it never stops, either, cause now i just worry about the babe all the time.
