Pregnant?

I took a test about a week ago (First Response) and it appeared negative. I took another a few days later (same brand) because I've been having symptoms I never have before my period starts. It said negative, however the one I had taken a few days before had a faint positive line on it. I don't know if it's an evap line or I just didn't see it before. What do I do?

UPDATE: I started my period so I'm not pregnant 😔 maybe next month