Traveling after Miscarriage

So I took one dose of Misoprostol Monday night after discovering I had a missed miscarriage. I passed 3 large clots Tuesday morning, and today finally passed the sac. Since passing the sac, all my pain, the cramping, and the bleeding has stopped. I feel completely normal again. Should I have passed everything? Would it be okay for me to go on a 4.5 each way drive tomorrow with my boyfriend? My parents are freaking out saying I need to relax but I feel fine now. And the whole point of us driving tomorrow was to get my mind off of this instead of sitting inside crying like I've been doing for the last 4 days.