Reference: Sharh ‘Umdatil-Fiqh – Tape No.7, Question No.18
Question: If a pregnant woman experiences a discharge of blood, is this considered to be from her menses?
Response: [No], the pregnant woman does not menstruate. The discharge that she experiences is not menses, rather, it is [just] a flow of blood, [and as a result, she is not required to bathe or shower].