Any chances?

Last Saturday my boyfriend put his tip in my vagina. I had made him cum earlier.. Is there any way left over of the sperm can go up my vagina? Could there be any chances of pregnancy
Help! My period starts around the 26th but i dont feel cramps, etc. which I usually get before i start my period. On glow it says my period will start on the 5th of December.. ? 
Im very confused. 

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