Hello, I would be happy to help you with your question.
You probably just had a chemical burn
of the skin on the scalp
. In response to this injury
, the skin "weeps" fluid. You probably just need to keep the area clean and avoid any further treatments during the pregnancy
, because during pregnancy the healing process is likely slowed down.
With regard to harm to your fetus, there really is no theoretical way that this could cause harm to the fetus. I would not worry and just wait until after the birth for your sake.
I hope this helps.