Hi there, I have understood your concern. I will suggest you the best possible treatment options.
1 ) First of all do not panic.
2 ) You are right in suspecting the
pregnancy as result of expelling out of the pill through vomiting or
diarrhoea.
3 ) In such situation, I'd I was your treating doctor, I would have suggested the following -
A. Start on anti emetics and antacids, like
ranitidine and Ondencetron. Anti diarrhoeal like
metronidazole.
B. If possible, take
emergency contraceptive pill within 24 to 72 hours of unprotected sex act. This will help to prevent unwanted pregnancy.
C. If this time frame is not feasible, then just wait for the expected date of the cycle. If you happen to cross your dates, then please get morning's first sample of urine tested for pregnancy. In case of doubt blood beta HCG test and USG will be of help.
4 ) Even If you are pregnant , you can opt for termination of the pregnancy with medicines safely till 9 weeks of the pregnancy.
I hope this answer helps you.
Thanks.
Dr. Purushottam Neurgaonkar