False positive or early positive?

3 days late on my period and have had all the classic pms symptoms (cramps, swollen sore breasts, tired, emotional). Yestersay i woke up with "period" that lasted a total of 6 hours. Just took a pt... and it's a faint positive!!! Do you think it's just early so the line is faint or can it be a false positive? (Updated w 2 pics...so faint but I see a plus sign!)