do you get positive when you are about 3 weeks pregnant?

Yes it's possible but the line would be very fine as there is less HcG in the pee which is what causes the line

yes possible, however not confirmed. to be sure you may want to wait and check at the 4th week.

Yes. it is possible to get a positive sign on the test kit at 3 weeks. Do give it a test!

Yes but test will show as faint line.

faint line.