Sweet Nibblets... thought my eyes were playing tricks on me?

Hey ladys so i had a rough morning! i tested this morning and got a BFN.... but then i tested at 2 pm on my break and well..... i have a very faint BFP!!!!!! i was asking all the ladies at work if i was seeing things but they said it was there! i am so excited but not getting my hopes up to much! i will test again tomorrow in the am to see if i get a stronger line. but what should i do..... it is very faint but it is there? i am 13 DPO and tomorrow AF is do.... one of the ladies said a line is a line, but what if it is a false positive?