My period??

Maira

Okay ended my period 2 Sunday’s ago, a couple days after my period I took a plan b. My next period wasn’t due until around December 1st which is BARELY going to be this Saturday. But, 1 week after my period ended I got my period again which was also after I took the plan b. I was told this was normal, but I’m going on my 9th day of my period and I’m VERY worried ! Please help! Should I go to my doctor??