Thanks for posting your query at DoctorSpring.com
You travelled mid cycle, when ovulation was very likely, if the pill failed.
ANd the vomiting and diarrhoea mid cycle DOES reduce the efficacy of the pill.
That is most probably why you got pregnant.
The failure of the pill is due to the flu that happened unfortunately mid cycle, leading to the non absorption of the pill.
Hence you ovulated and conceived.
Very unfortunate, but yes, it makes sense I hope now.
No, even if you took the pill right until today morning, it will not hurt the pregnancy at all.
All the best
Please feel free to discuss further.