Question? And Need Help 🤷🏼‍♀️

So glow told me I would ovulate one April 21st. Which on CD 16 I did get a “darker line” which I assumed it was because that day fell in my “fertile window”.. However as the days went on they didn’t get darker. Until this morning.. I took the test and I got my “peak”. My question is, Is it still valid if I used FMU?