emergency pill can cause side effects like nausea
, vomitings, bloating
sensation of the abdomen etc
that may be the reason for your symptoms after taking the tablets, as you had vomitings after taking the tablet complete protection is somewhat doubtful,
if you had intercourse around the time of ovulation then there is possibility for pregnancy
, as the effect of the emergency pill is doubtful, so if you miss your periods better to go for pregnancy test once.