A dosa batter that suddenly tastes different is usually over-fermented or starting to spoil, rather than something dangerous on its own. At 6 weeks, eating a small amount of slightly off batter is unlikely to harm your pregnancy directly, but it can occasionally cause an upset stomach.
Next Steps
Watch for nausea, vomiting, loose motions, or stomach cramps over the next day. Stay well hydrated with ORS, coconut water, or boiled water, and eat light, simple food until you feel normal.
Health Tips
See your obstetrician the same day if you develop fever, repeated vomiting, or cannot keep fluids down, since dehydration this early needs prompt attention.