Am I pregnant

I had unprotected intercourse 12 days after my period (12/11/18-12/15/18 period dates). My stats on the tracker said I had about 11 days until my period for January and 27 days until my next ovulation. Mind you this was my first time... anyways he kept stopping ( pulling his penis out) and the last time he stopped he jerked away from me, I’m not sure if he cummed in me or not but I’m scarred because I didn’t take a plan b or anything of that sort. I did however like two days ago I had a whiteish discharge that is somewhat clumpy & at times is smooth I never seen anything like that before but curiosity killed my cat & I started researching. I got various answers as to what it would/could be but I’m not understanding any of it. And my January period is due in two or three days and I haven’t experienced my normal heavy cramping. I talked to my older sister (26) and coworkers they said don’t worry about it because it’s not very likely but I can’t help but worry because I’m stuck. Somebody please help me 🤦🏾‍♀️😭.