Help! I’m so confused

Courtney

So I keep seeing that your fertile window is roughly 5 days. The app says I was ovulating the 8th. But I’ve been testing my LH level since the first and have gotten two lines since then. My last period started on Christmas. It doesn’t make sense to me that I’ve had a LH surge for 11 days if your window is supposed to only be 5? I’m confused because I thought I had ovulated and now I don’t know what to think!