Period

I'm new to using an app to track my period.... can someone please help me understand. . I have a really heavy period from July 9th to July 13 then in the month of August a had a very light period for 3 days and then spotted for 2 days I was supposed to start my period again today and I haven't I have been experiencing alot of tenderness in my breast and I'm constipated. ... I can't figure out how to make it show that I didn't start my period like I should have.. someone please help me