I really hate to be one of these people but..

On the 19th my fiancé and I had sex. Before he put a condom on we were grinding on eachother naked and the tip of his penis went in me for about 5 seconds and then he put on a condom. I was supposed to start my period today and I have no signs of it. No bloating or cramping. Is there any way I could be pregnant? Thanks in advance! :)