Hi there,

yes vomiting and diahorrea affect the pill, they recommend that you use other forms of contraception if you have had either of these two.

The other thing is that if you do fall pregnant while on the pill, they advise that you stop taking it when you find out. so most women would fall pregnant in the middle of their cycle (or there abouts) so it would be approx 2 weeks before you would know that you are pregnant anyway so im sure that it wouldnt do a lot of harm.

Hope this helps!!