For girls whom are just starting it’s normal
Hello,
What you are having is intermenstrual bleeding and irregular periods. You should consult a gynecologist and get yourself thoroughly examined to diagnose the cause of irregular periods which can be due to hormonal imbalance, stress, chronic illness, polycystic ovarian disease, thyroid gland disorders or diseases, pituitary gland tumors or cyst, galactorrhea, prolactinomas etc.
I hope it helps. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.