<s>[INST] Hi, I had unprotected sex on last Thursday and Saturday and I had emergency contraceptive pill on Saturday. my periods were due on Saturday. I still havent got my periods and I am feeling pukish and lethargic. is there a chance I am pregnent or is can be a side effect of the pill. I am also having brown discharge everyday since Saturday. [/INST] Hi,First, you cannot get pregnant with an intercourse just before the onset of period as ovulation occurs 14 days before the onset of a period and this is the fertile period which can cause conception. Moreover, emergency pill contains excess hormone and this causes disruption of the normal hormonal milieu of the body. This results in breakthrough bleed, menstrual disturbances and delayed periods. If you do not see a period even 10-14 days after your period is due, you should see a specialist for further help. Hope this helps. </s>