First morning urine, does it really make a difference?

Laura • Straight edge, vegetarian, feminist, lover of animals.
Yesterday I took a First Response Early Detection pregnancy test, at 10 pm it came back negative. While the box said it could be use anytime and it was extra sensitive it had me wondering, because most TTC forms say FMU is the best to use when your POAS
​What do you think?  

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