Is it safe to take a 10 hour car ride at 20 weeks pregnant with twins. last ultrasound was perfect, cervix 3.04cm (not sure if this is a concern but ob was happy with it). no pain. any risks to the pregnancy doing this? i wont be the one driving?

This is likely okay. I would plan with the driver to stop and get out for a brief walk every few hours to keep your circulation moving/stretch your legs. Be sure to pre-plan what you would do if problems arise in route/where to go for care.

You should be fine, but are at increased risks of blood clots with long periods of inactivity, so pump your feet frequently and walk every hour! Even a long drive can be exhausting, so get plenty of rest, drink plenty of fluids. avoid caffeine.