Faint line on two pregnancy tests?

i took a test monday first thing in the morning and there was a faint line so i took one on tuesday morning again and there was another faint line.... so im not really sure what that means?? has this happened to anyone before and you were pregnant ?? i no if there are two lines your pregnant but there really faint so im not sure .... i used the doller store brand ? im going to retest in a week or two .. thanks