Day of the period beside date

I don't know you but I really think this app should show the day of the period beside the number of the calendar day. I'm starting a fertility treatment and I need to take some medication on specific days of my period and I need to make some test to depending on that and I always have to enter the calendar and start counting days manually which is not practical at all and its always possible to make a mistake.

Please GLOW change this so it's easier to track all this things!