Food-grade herbs, such as ginger and pepper, are generally safe. "That's when miscarriages are most likely. Also, though, "...you should look up the safety profile of the tea…" before drinking it, Manglani said. When consumed in moderation, chai tea and similar drinks are considered safe for use during pregnancy, with some caveats. Healthline Media does not provide medical advice, diagnosis, or treatment. This is all due to high caffeine component.