ANSWER:

You must fast that day if your menses get over before the fajr. You can take your suhoor and then take ghusl after the athan in order to pray your fajr. 

When my menses is going on, And when it gets over before fajr prayer or suhoor, what am i supposed to do, should i fast without performing ghusl to be pure or i will leave that roza and continue to fast from the next day.?