Basic TTC Questions

New here and not hip to the Acronyms just yet except one..."TTC", lol. So I'm TTC and wondering a few things. It's been 4 days since my ovulation day and only 3 since being fertile. We were active during said days. I took a pregnancy test today but wondering if it's too early? When is a good time to test? I guess the more accurate response to that is to wait for a missed period, lol. But wondering if my pregnancy test today being negative is because it's still to early to detect?