<s>[INST] Took postinor2 within 24 hrs after sex, bled for a few days then period started just after 2 wks, but haven t seen the next period which is now delayed for almost 2 wks. Ran some test with pregnancy strip which keep switching btw positive and negative. Just confused....any chance of pregnancy? [/INST] Hello dearI understand your concernYou have taken Postinor 2 with in 24 hour of the sex and it is highly effective in preventing the pregnancy.It has just 1-3% failure rate.Bleeding few days after is breakthrough bleeding due to progesterone withdrawal effect.Your period will come early is again due to hormonal imbalance caused by the postinor 2.Your delayed period could be due to hormonal imbalance.Pregnancy test will give sometime false positive result.I would suggest to consult the gynecologist and undergo proper examination and blood HCG, reproductive hormone analysis.Period can be induced by the progesterone pill in absence of the pregnancy.Avoid stress, take healthy diet, drink plenty of water and do regular exerciseHope this may help youBest regardsDr. Sagar </s>