Yep. It's a homeopathic, so entirely safe in pregnancy
I only had fairly mild ms but when I couldn't stand it, or was worried it would affect my ability to do other things, I went straight to the natural health 'apothecary'! I doubt regular natural health shops would have it, so go somewhere where they dispense remedies.
The strength of the dose doesn't matter as much as the frequency - you take it (e.g. every 10-30mins) until you start feeling better.
HTH.