My period is irregular and it never had been before...what should I do?

So my period has been lasting a lot longer then normal, I normal only have my period for about 8 days. But since November I have been having irregular lengths in period that last around a month long and then within one week my period starts aging. I am only 16 so I’m not sure if I should go and see the gynaecologist or not. Please leave comments to help me or if you have any similar stories.