Is this normal?

Cassie

So the apps I use told me I would’ve ovulated around the 8 or 9th of September,

I just received in my ovulation tests yesterday so I decided to take one, and it was .87 so it changed my ovulation date to yesterday. Now it says I’m 1DPO when originally it said 6DPO. Sorry if that sounds confusing at all. I’m confused 😂