When’s the earliest I can take a test

I got on my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period app</a> this week to log the days my bf and me had sex and realized most of the days were apparently fertile days. I know the app just estimates and is not always accurate so idk if I could have actually even got pregnant but I’m having anxiety now and want to test asap just do not know how soon I can. This is my calendar this month my last period was Jan. 18 when’s the soonest I can take test