I Took a pregnancy test. Not sure if it is a BFP?

I just took a pregnancy test like 3 minutes ago. Im looking at it and I swear a can see an extremely faint line but only when I look at it next to the light. What does that mean? Do you think it is just the light causing me to see the line or do you actually think the line is there? AF isn't due until friday. Should I wait to test again then? Any input would be great. Thanks in advance and lots of baby dust to you all.