Been on my period for 5 weeks??

Please help this scares me so much I went to my family doctor yesterday who said some girls just get spotting long after their period started. I’m not pregnant not sick not yeast infection and I’ve never had spotting before in my life the long way I pms is like 5-6 days. I don’t know why I jut don’t trust my doctor like usually I just trust in him anything he says but I was really unsettled when he told me that was normal I’m scared