I swallowed a temporary dental crown while eating a medicine!So I'm worried if it gets stuck inside my stomach!

no, do not worry, it will come out, and you should just go to get the new one,. temporary crowns its very easy to fall out.thats why we place them in temporarily .

Dear Paruhang12.It is not uncommon that someone swallows their crown(s). The
crown will not get stuck in your stomach. Naturally, like everything else that
is consumed, it comes out! Crowns are not cheap, therefore you might want to
retrieve it. I have a video on YouTube that explains exactly what to do should
you swallow your crown. Be brave and strong, it
is just like "curbing you dog". Take several plastic shopping bags
(the kind you may get from the supermarket) and create a double thickness bag.
Slip half of it under the toilet seat so it stays open and out of the water.
Go ahead and proceed carefully with the next step...All the solid material
inside you and hopefully your missing crown should now be in the double bag.
You survived!
Remove the bag from under the toilet seat, tie it closed and place it upright
in the bathroom wastebasket. Feel for the crown through the outside of the bag.
Do what you need, to recover the crown from inside the bag. Wash it off with
soap water; do not lose it in the drain! Bring it to the dentist to be
sterilizedand have it re-cemented. Best of luck.