kegg should not be used during menstruation.  Note you bleeding within the mobile app and resume your daily kegg readings once your period ends.
Please note that if your attempt to conceive becomes successful and a fertilized egg attaches to the interior lining of the uterus, something is known as implantation bleeding/spotting may occur around the time of your missed period. This attachment of the fertilized egg can result in light bleeding or spotting, which is completely normal.
If you test positive for pregnancy, congratulations! Please record your positive pregnancy in the app and discontinue kegg use for the remainder of your pregnancy.