My period is late by 4 months ... Should I be worried?

Hello!

I’m currently 16 and I’ve been having an irregular period recently. I’ve had my first period when I was about 11 years old and there were times where it was irregular but it has never gotten this late. I visited a gynecologist when my period didn’t come for 2 months but she said that there shouldn’t be any problems as I am still a teen. However, I am still a bit worried since it has been about 4 months since I had my last period. Should I be worried?