pregnant with period ?

sarah سـاره • 👧🏻 18Dec18
i got my period on 18th of Feb and it was normal, but on 20th of Feb it stopped!!  I did pregnancy test and it was only one line.  so after two days i had sex and i got very light blood for 30 minutes and it stopped! Am i pregnant? but didn't show yet? or this is normal? did anyone had the same?
PS. My period normally 7 days.