It's not normal to have irregular periods  ( early or late), missing periods, spotting between periods, prolonged heavy flow, pains and cramps during cycle, PMS and mood changes before periods, PCOS, Fibroid, Endometriosis,  fertility issues, tiredness, hair fall,  sleep disturbances, weight issues etc. If it is happening to you,  it's a sign of underlying  hormone  imbalance  which needs further evaluation with blood investigations , scan etc.Good news is that all your problems  can be totally  reversed , not by masking the symptoms  with pills but by addressing  the underlying  cause of the problem and healing it from the ROOT cause which is not in your pelvis BTW. Hope it helps.....

Do pregnancy test either by urine or blood test.Blood test is more reliable .If negative means no pregnancy then take tablet for withdrawal after consulting to gynaecologist.

Yes if you are married and hv not got your periods since 3months it can definitely be due to pregnancy. Do a urine pregnancy test by kit at home to confirm the same.