Can Plan B be messing with me?

Jocelyn • married, Mother of 2🩷💙
So June 1st i had unprotected sex and about 2 hours later i took plan B. A week after I had spotting for two days only. Was my first time taking plan B and my period been late since then. Lately i been feeling nauseous been having headaches and low back pain. I didn't get my period last month and i haven't experienced any cramps. Is it too soon to be worrying?