plan b side effects after week later ?

so i took plan b about a week ago, that same week i experienced some spotting/ bleeding. but it only lasted about 3-4 days. now i’m having slight stomach pain, but it feels crampy, bloated, and just uncomfortable. i’m also feeling a little nauseous and i’ve been getting horrible headaches. is it normal to experience side effects a week after taking it ? i’m just super nervous, it’s my first time taking plan b. i’ve been really anxious