4 days early!!!

hello everyone...me and my partner have been trying for a baby for a couple of months now I have an app on my phone that shows me when I'm about to come on my period and when I ovualate I only dowloaded the app a month ago but this month strangely enough after following the app And having sex on my (high chance pregnancy) and ovulation day I was 4 days early I was meant to have my period today but got it on the the first Of this month it was lighter than usual... I have been feeling extremely tired and dizzy I feel sick most of the time and I'm getting little twinges in my belly (sounds strange I know) can anyone help me could I be pregnant? I don't want to take another test because I have been trying so long I'm going to be upset and frustrated if I see another negative test... Help