so confused

okay so i took two pregnancy tests last night because i was stressed out about being pregnant and both were negative, however, my bf checked the tests again this morning and one had this faint line. the directions on the box say to ignore anything that occurs after 10 minutes (this was like 6 hours after) so should i take a couple more tests or be worried? could it have been a false positive? or can someone just explain what's going on?