How would a scorpion sting affect me while pregnant?

Scorpion sting. If you're healthy and strong, a scorpion sting will be painful but probably not dangerous for you or your baby. If you have more serious symptoms like blurry vision, muscle twitching, roving eye movements, or numbness beyond the area stung, for sure go to an er. If you live in the southwest, the az bark scorpion can be a bad one. Your body will likely protect your baby's, but still be seen.
Not much. The scorpions around here are more an irritant than a threat. Their effect is much like an ant bite or bee sting. Unless you have a specific allergy to them their bite will pass without effecting the baby.