I had a medical abortion 5 days ago. im not sure the gestational sac passed. i've been feeling something like morning sickness on and off since then?

Possibly: It can take up to 4-6 weeks for the pregnancy hormones to go down to zero and the symptoms of pregnancy to go away. That being said it is possible to not fully pass the entire pregnancy. It is very important to keep your follow up appt with your provider or make one of you don't have one to make sure the entire pregnancy passes. If you are having very heavy bleeding or are dizzy or weak, go to ER