Hi!... I'm on the combined pill...if you vomit 2 -4 hours after you've taken the pill then you have to continue taking the pill as normal but use other precuations for 7 days! - if you dont have 7 pills left before the usual break then DONT take a break - its too risky!! As for diarrhea etc, seriuos diarrhea needs to be dealt with like the vomitting but if its just a bit - ie if you can leave the house then its safe. Hope that helps... x ps. the 7 day time when you have to use other precuations starts after you have stopped being sick - not feeling sick.