Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 3 months ago

This discharge during pregnancy is not menstruation. It can be what is
called Istihadha. During Istihadha, females must perform Salaah but
she has to perform Wudhu for every Salaah if the quantity of the blood
is small. But if the quantity of the blood fills the whole pad, then
she has to add one Ghusl in the morning before morning prayers and one
Wudhu for every Salaah. If the quantity of the blood is too much that
it not only fills the pad but it leaks out then three Ghusls will be
obligatory - one before morning Salaah, another before Zohr and Asr
and third before Maghrib and Ishaa Salaah.

Wassalaam.