What do you think?

Latasha
So me and my boyfriend of three years are trying for a baby. He has cummed in me and everything. My period was expected to show today. 3/15/14. I know that my period is going to come because I usually cramp the night before. I have had no signs of my period coming or anything. Could I be pregnant? When should I test? My last period was 2/11/14.