Hello, First of all, you should repeat the home pregnancy test or undergo blood test for beta-hCG to clear confusion about pregnancy. NEGATIVE test result indicates you are NOT pregnant and abortion pill shouldn t be taken in this case. Progesterone pill will help to induce period if delays more than 1 week. Abortion pill is indicated only in POSITIVE pregnancy test and in that case, you must consult with gynecologist for proper guidance. Other reasons of irregular period could be PCOD, hormonal imbalance, over wt/ extreme loss, mental stress, emotional upset, eating disorder, thyroid problem etc. You may need to undergo one USG lower abdomen and hormone test in the absence of pregnancy. Kindly, consult with your gynecologist and take advice accordingly. Combined hormonal pill is quite effective to treat irregular period. You should control body wt, avoid stress, take healthy low carbohydrate diet with avoidance of fatty food and sleep properly. Be well.