pregnant???

i had sex on november 28th and my period is due tomorrow. i’ve had cramps since tuesday and sore breats that feel a bit bumpy. my period came on the 13th for two months in a row and usually never happen, it comes about every 27 days. i’ve been a bit nauseous but i feel like its out of nervousness because i havent exaxtly felt like i was gonna throw up and i had a lot of white discharge a few days after having sex but its not very out of the ordinary. im not a birth control and we used a condom but i dont know if there was a small hole in it. please help im only 15 and my bfs 17 do you guys think i could be pregnant???