FRER unsure if Positive

Ok so yesterday and today at 3:30 I took an old style FRER and they both came up with a very very very faint pink line - you can see the line when you look at the test you don't need to tweak or tilt to see the line but I've heard so many bad comments on this brand. I read within the 3 minute timeframe - I can't seem to get a decent picture - has anyone ever had a line this faint and actually be pregnant? Could it be an Evap even though it's a very light pink? I want to be happy but I'm unsure if it's my BFP - I thought the line would be darker today but I only waited 24 hours - how long would you suggest I wait and take another?