Hello Am 17,I Have Been Having Irregular Periods! Due To

Hello am 17,I have been having irregular periods! Due to my irregular periods I can never track my ovulation+ I have not been using protection when having sex. The periods I had been having are a full 7 days long and usually are around 35-37apart, recently my period was 5 days long and very light (seemed to be more discharge than period), 7 days later it was 2 days long and light now 4 week after the spotting my discharge is pinkish purple and drys brown is this normal?