Help!! Missed period

A few days before my period was suppose to start I spotted for third days and each day it lasted for about an hr. So I was thinking maybe it was implantation bleeding.
​So I took a few prego tests and all of them had said negative and I had one that may have been a a very very faint positive but we aren't sure.
​Well now my period is a week late.
​Before I go to the doctor could there be any other reason why my body would be doing this?
​My significant other thinks the spotting could of been my period but it was way to light for me to believe it.