Preganant?

So on May 21st me and my boyfriend had sex and he accidentely ejacualted inside of me. (No i am not on birthcontrol) It was already 3 days before my period was suppose to start. Now its day 3 of my missed period and still no ovary cramping or bleeding. Am i pregnant or is it too soon to tell? (Mind you this all happend May 21st and It is now May27th)