Period? Or just spotting from plan b?

Hey ladies,

Last week i took a plan b for the first time and i had a rough time with it. Today i was spotting and it was enough blood for a liner so i assumed it was my period starting early(my period just ended about two weeks ago and isnt due til the 22nd)fast forward to now i took a shower and the blood has basically stopped. Should i assume this is just spotting? Or a weird beginning to my period?( also having small vaginal cramps??)