pregnancy

I have a long distance relationship and the last time I had sex with my boyfriend was during Christmas time, from December 21st to January 1st. One day we were using a lubricant and then he put a condom on. He always cum out but that time while he was going out the half of the condom stayed inside of me (because of the lubricant we used before) and he cum out. After one week I had my period normally but now I’m a little worried that I can be pregnant. My period should arrive in 3/4 days. Is there any possibility that I’m pregnant?