 [ Symptoms ] can i wear some type of mask to prevent me from inhaling second hand smoke while i am pregnant  i am 5 mos pregnant and work at an office with smokers one smokes cigarettes or e cigarettes but outside so i rarely smell her smoke the other smokes a pipe inside the office both assure me that the tobacco products they use have no chemical additives and are all natural am i still at risk from their smoke if so will wearing a dust mask or other filter prevent me from inhaling the smoke it is not an option for them to not smoke around me and i cannot work from a remote location [ Disease ] it sounds like you may still be having some spotting where the flow of your menstrual period has gotten very slow indicating that you are probably getting near the end of your period the blood may look like a brown color so your period does not appear to be over quite yet