afraid to be preg

i had sex on december 9th which was like 7-9 days before my ovulation day and he came in the condom. it was protected the whole time and we even checked to see if the sperm leaked out of the condom  but it didnt. and im supposed to start my period in the first week of january and im afraid it'll be late and i'll start stressing up lmao but i cant be pregnant right?!