Period 2 days late

I had my period last month dec 2-6 and got period again on dec 26-28 (not spotting because I had a heavy-ish period that time) now im 2 days late and mg boyfriend kept ontelling me to calm down because he told me he wouldnt do anything to ruin our future and stress can really affect my cycle :-( somebody pls calm me down.

mood has been really weird, gets pissed off alot and my boobs (nipples) r hurtingggg affff