Possible pregnancy or not?

Hi ladies I have a question on regards to this app. I have been tracking all my periods for very long and I am wondering how accurate is the ovulation cycle in green here in my calendar chart? I am trying to conceive and me and my partner had sex a day before my ovulation started (according to this app)

It’s been 8 days so far but I’m wondering when is the soonest I can take a pregnancy test? And is there a strong possibility I will be pregnant? I’m very regular with my periods.

Waiting so long has made me so anxious😣 I hope I can get some answers here💖