Horizontal line on pregnancy test

My boyfriend and I have had sex a couple times (4-5) and we always use condoms. There was one time when we were both naked and his penis (along with pre-ejaculation) made contact with my vagina but there was no penetration. Lately I've been contemplating the idea that there's a chance I might be pregnant. I decided to take a pregnancy test and the results showed a line in the control window and a faint HORIZONTAL line in the results window. The packaging of the PG test I took only shows vertical lines. Does this mean anything? I've read online that horizontal lines are just "travel lines" but I'm not sure. (P.s I'm planning on taking another test in the next couple days)