Ovulation question!

If you think you ovulated late how much would that push back your period? I was supposed to get my period July 3rd but nothing yet. I had unprotected sex with my husband the day before my expected period. I should note that I’m 11 days late and I’ve only ever been late with my first baby.

I have taken pregnancy tests and they are negative. Could it be that I’m also very early and it’s not showing positive on the test?