Ethanol St. John's wort extract, which is a component of gastric drops, contains hyperforin, which, by affecting liver enzymes, can - theoretically - disrupt the action of birth control pills. In practice, such an effect was observed after long-term administration of large doses of St. John's wort extract, significantly exceeding the amount contained in gastric drops. Given all the details in the description, I don't think there is any risk of getting pregnant. You can use an additional method of protection (condom) for the next week, although this is rather an extra precaution.

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https://www.gdziepolek.pl/artykuly/czy-jedzenie-i-picie-obnizaja-skutecznosc-antykoncepcji

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