Plan B Question

I hate to be one of THOSE people, but I took plan B about two weeks ago, and I haven’t had any symptoms from it. I usually have some sort of symptom by now, but I haven’t. No gas, nausea, slight cramping, diarrhea... nothing. The only thing I’ve had is moodiness, but I can’t tell if its from the plan B. My period is due in 8 days, and if I’m late I’ll test, but until then: Do no symptoms mean it didn’t work? I read on here recently “you have symptoms, that means it worked!” And I’m not sure how accurate that is so I thought I’d just ask. Thank you!