Confused... Am I pregnant?

Erin • My husband and I have been together for almost 6 years (married 2). We have a 3 year old son and we are wanting to add to our family. Our son needs a sibling, lol.
I took a pregnancy test this morning(period due today) and it showed negative, but hrs later as I was gathering trash I noticed there was a faint line. It turned positive.... is that possible? I know you aren't suppose to read them after 10 mins...