Our expert says:
I am not sure what you mean by serum. What often happens is that if you concentrate on looking for ovulation and mucus changes, you notice things which have always been there but which you have not noticed before because you have not been concentrating so hard. I would suggest that you see what happens in the next few days. If the small persists, you may have to consult a doctor. A smell would not indicate either ovulation or pregnancy.
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