Alcohol and BC


ok i had a crazy night and basically was hungover in the morning. i took my bc at 6 am cause that’s the time i always take it. and after that at around 8 am i threw up cause i was hungover i threw up maybe 3 mores times after that. the last time i threw up it was maybe 11 am. i don’t think i threw up the pill i never saw it come out so.. then when i used the restroom at 12 pm i noticed that i had spotting on my underwear. i did however start a new pill so that could also be normal idk?? or could it be because i threw up the pill by chance? pls help (i also had sex today at around 9/10 am and he finished in me) so if i did throw it up and the bleeding is because of that should i take a plan b?