I skipped a period in november and then regular cycles returned up until now (no period in may, still waiting). is my body going through a phase?

Hormonal imbalances: You are probably periodically not ovulating. Did you start menstruating late like 16, if so it might be normal, but most likely still not ovulating every cycle. Do you have acne, mood swings, weight gain where you don't want it? You might ask to be evaluated for stein leventhal syndrome otherwise known as polycystic ovarian syndrome and can be diagnosed by blood hormone tests.