Accuracy of certain tests?

Jessa<3 • Happily married to the love of my life. <3 Mommy to two handsome boys, William and Grayson, and a beautiful daughter, Nora 💙💕
I bought a Walgreen brand test, and I have a first response. I kind of want to save the first response one just in case, but how accurate are the Walgreen brand ones?