###Human: Will taking two emergency pills within a week cause delay in periods? ###Assistant: Hello. Unwanted 72 has a side effect of messing up periods and since you have taken it twice so probably your periods are delayed due to this reason. I would suggest doing a pregnancy test to be sure and if you vomited the next day, then it had not affected the efficacy of the pill, and your symptoms may be due to anxiety or stress due to delayed periods.