Could I be pregnant?

My boyfriend and I had sex on the 28th. He wore a condom. He came in me, but still with the condom on. After that I checked myself to make sure nothing got in me. He checked the condom too. My period is now 4 days late from my eve prediction and I'm becoming more and more scared. Could I be pregnant? I didn't see any cum in my vagina.. I do have the symptoms I usually get before my period but no period, I've had them for about a week and a half before we even had sex. (That was the first time we has sex since before my last period. My breasts are sore and tender, clear and white discharge.