Spotting and late period

R

My period is about 4 days late, and I’ve been spotting for about three days. Very light spotting, and it’s a light pink color. My breasts are tender and I have some acne and some bloating. There’s no chance I’m pregnant- I didn’t have intercourse (I did give and receive oral sex- but that’s besides the point). Has this happened to anybody else? Why could this be happening? I know 4 days aren’t that many, but I’m usually right on time or even a couple days early. I’m just concerned :(