Name brand vs Strips

Brandy • Married, hairstylist, mom of 3!

So a friend gave me some first response ovulation tests that she doesn't need, she bought them by mistake meant to get pregnancy tests. Anyways just to see I used one of them and my test strips. I got A blazing positive on the fr and not even a hint of a line on my strips. It makes me wonder how accurate my strips are vs the fr.