(I'm not sure if this should go here, but feel free to move if in the wrong place )

The last few days I have been doing my normal exercise, (on the cardio twister thingie) and when I stop I get a cramping... First time I did maybe 1/2 hour and thought I over did it... so yesterday I did only 10 mins and still got the cramping...

Do you think this is normal?

It's not an impact exercise, and when I exercise I make sure that I can talk (well sing along to the music!) So i'm not pushing myself too far...

My problem is, if I give it up I will gain too much weight (already considered high risk because of my weight), and I won't have anything to exercise on/with?

(we are 10 hours from a local pool/gym/ pregnancy yoga etc)

any ideas?