Hi there. The very best thing to do is to wait until the day you'd normally get your period. (usually 2 weeks after ovulation). It's hard waiting, I know. They do make early detection tests that cost a bit more. I used one and got a positive four days (as the brand advertises) before my period was due. BUT, that is risky as it simply can be too early to test. So, if you can hold out, wait until your period is due! good luck
It can't be dected on a pregnancy test till about 4 sometimes 5 weeks the only other way you would find out sooner is with a blood test. I was 6 weeks and 4 days when I found out with my daughter