How reliable are Boots Pregnancy Tests?

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I've taken 2 Boots pregnancy tests - one last night and one this morning, and both have very faint lines (can't really see on a photograph). I have a 7 month old dc so this wouldn't be the best news right now if I was pregnant. Couldn't see a line on the test last night but can now and this mornings I left about 30/40minutes whilst feeding dc.
I'm going to buy a first response test later but anyone know if boots tests are renowned for giving indents?

Anyone? How can you tell if it's an evaporation line? It's pink but very very faint

You should only leave the test for the amount specified. If you can't see a line after that time then it's a negative. If you've left it longer than I would imagine it's an evap line x

If you didn’t read either in time, you haven’t really taken a pregnancy test yet... can you get two today, one for tonight and one for your FMU tomorrow? But make sure you can read them in time or they are as good as useless. It’s usually within 2 minutes or so.

Which kind of Boots tests are they? I found their early response tests gave me a much stronger line than a FRER using the same sample and I would use them over a FRER in future. But yes you shouldn’t be looking at them after the time specified.