Opinion on dollar tree tests?

Wondering everyone's opinion on Dollar Tree pregnancy tests. Did you find that they're accurate or did they take a while after the missed period to show positive? I expected AF this last Wednesday but have taken four Dollar Tree tests which were all negatives. I don't "feel" pregnant like I did before my miscarriage in March, so I'm not totally expecting it to be positive, but just wondering if they're worth the money saved or if I should always go for brand name.