I suggest you keep a written diary for the next 2 or 3 months to
record your
menstrual cycle and also jot down any mood swings which can sometimes happen about 10 days before a period. Also keep a note of any changes like tender breasts, fluid retention as well as exactly how your periods are - light, brown, pink show, heavy, clotty and so on.
All these will help give a picture to your doctor should you need to see him if your periods do not start to be "normal" again.