There is little information available about
hair loss during pregnancy, but one possibility is that dry
hair may become drier as a result of high levels of progesterone, the female hormone produced in the ovaries. Progesterone works with oestrogen to regulate the reproductive cycle. If this is the case, your hair will be more prone to crack and break, especially in later pregnancy. As it breaks off near the roots it may appear to be hair loss, although it actually isn't.