late period

my period was supposed to come yesterday, i’m a day late. my last period was from august 3-8. on august 18th, my boyfriend and i made out, we didn’t have sex but he did cum and it got near my vagina (no penetration). i took a plan b pill just to be safe less than 24 hours later. i’ve been having what feels like period cramps, bloating, constipation, diarrhea, and swollen breasts ever since. (these are my typical period symptoms with every cycle). i’m getting kind of anxious since my period hasn’t started yet, but i’m like 95% sure i can’t be pregnant. any thoughts on what i should do? wait it out? take a test?