How accurate is this?

Mama of 3 • Tue, Aug 27 • Wife & Mama of 3 ASD supporter 🧩 2 princes🤴 1 princess 👸🏻 Coffee ALWAYS ☕️

I did not take this with FMU, I drank a lot of water today, BUT I’m 1 day late and this came up immediately. Anyone use these tests before and have an issue with false positives? I have a 7 month old and honestly didn’t expect this.