When should I test?

During my ovulation cycle (fertility window) we had unprotected sex 3 times. We’re trying for a baby now. I’ve already had 2 kids, this would be his first. We’ve tried before but never were successful. We’ve recently started tracking my cycles to just have a better chance.

I should have started my period Monday, I had all of my usual week before period signs. However this time I’m SO nauseous, not like morning sickness, just nauseous. I’m almost 3 full days late for my period since the ovulation cycle now. When do you think I should take a test? It’s hard not to pee on a stick every 20mins now… I’m scared to get my hopes up, but how can one not?