hi...
i had an intercourse about 1 week and 3 days ago(i ate morning pills after it) and after 1 week i had me tested with baby check and i wasn't pregnant. today i had a mucus plug came out of me and im so scared! i searched about it and im sure its a mucus plug. can i still be pregnant?
Can that happen to a none pregnant person?

If you are pregnant, it would be too early for a test to be positive after only one week. It would also be too early for a mucous plug to develop, much less be lost.

What you may be experiencing could be nothing more than increased discharge.

Unfortunately you now have to wait until your period is two weeks late to test to get an accurate result.

So.. why the mucus plug came off me? Do u have any ideas?

No mucous plug came out of you. Most likely it was increased discharge. The morning after pill can cause increased discharge as well as irregular bleeding.