This may get graphic but I really need answers right now. Sorry in advance.

I'm 16 years old and sexually active. During my fertility week, I gave my boyfriend oral. When we finished, I usually lick up anything left (explicit, Im sorry) and he puts it back in his pants. Then, he fingered me afterwards. Now Im on Day 31 of my cycle, already a day late on my period. I have had no PMS symptoms whatsoever. I usually have sore breasts a week before my period, and Im usually very irritable and angry. But there's nothing. And Im already late. Could I possibly be pregnant?