The scenario that can occur with menstruating women: What if she has a regular monthly period but one month she has only spotting but it’s at the regular time of her typical cycle and with the same physical symptoms? The only difference is the type of discharge.
This is considered her hayth blood.
The scenario that can occur with menstruating women: What if a woman normally has a typical menses (heavy discharge, etc), but due to circumstances, such as diet or travel, her cycle changed and became just spotting and without her regular physical symptoms? Is this still hayth?
No, not for that first time. Only when she has her regular type cycle will she need to refrain from her prayers.