Pregnant?

I am 4 days late for my period.  I took two tests yesterday that came back with faint positive likes, but because it was the blue ink ones (I've heard those are easy to get false positives with because of the water line) I decided to take two first response ones today and I got the same result, in both the pregnancy line was there. It was faint, but there!!! I have a doctors appointment Tuesday to make sure but I'm just really unsure about it. Help?