Need help figuring out what to do

Caitlin

I haven't had a period since December 2020

And I have no symptoms of pms or pregnancy. I just started spotting and I don't know what it could mean. This is the longest I've ever went with out a period and the last time it was was back in 2017 and I didn't have a period for 176 days. If anyone knows what could be causing this let me know. I've never been diagnosed with PCOS or anything else like that