Hi I had my baby 4 months ago, I had slight bleeding in the 2nd week went to see a doctor but there was nothing wrong with me I later had a thick dark brown mucoid discharge that stopped , recently about 3 days ago I noticed I had a thick mucoid dark brown discharge, I have been breastfeeding exclusively and have not had my periods yet I had unprotected sex 12 days ago please advice, could I be pregnant?