Hi and welcome to HCM,
I am Dr Nilajkumar a consultant gynecologist and I will be helping you in your queries.
It seems that you have had the patch for extra time than stipulated and it also fell off. This reduces the contraceptive
efficacy of the patch.
So a pregnancy
must be ruled out. Please get a urine pregnancy test done 3 weeks after the date of unprotected sexual episode. You may even get one now as you are having nausea and vomiting
If it is negative, this may be due to gastritis
and tablet omeprazole
will help. Continue your next patch as prescribed if the test is negative.
Hope this was helpful.
Thanks for using HCM.
Have a good day.
Dr Nilajkumar Bagde
Consultant Obstetrics and Gynecology