Thanks for the query.
According to your description there is possibility of some liver
So you once consult gynecologist, get examined and go for liver function tests.
What your friend told is not true. The color of the stool can be change in liver disorders, due to iron supplements
Anyhow as you are planning for cesarean section after few days, better to get examined.
Because normal general condition is needed for problemfree operation and anesthesia
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429