What's wrong with me?

I had unprotected sex with my boyfriend on the 16th of June. But I tracked what days I was ovulating and it said on the 9th-14th. And my boyfriend said he didn't c** in me, n besides I didn't feel it. But lately I've been feeling really tired, nauseous, agitated and I've been eating a lot more. My boobs look slightly bigger and hurt even when I shower. I should have gotten my period yesterday but I didn't. I know my period could just be late and these are all pre-menstrual symptoms too. But is it possible that my ovulation calculator was wrong and I did actually get pregnant?