Help with my chart (newbie)

Aileen • Mommy of 2. 2 previous MC.
I recently got out of of birth control (implanon). Last month my cycle was 28 days, although it says that Af will be 4 days shorter since I ovulated right after my menses. We'll I have deligently been taking my bt but am just clueless specially why my temps are so constant. Help?  After the 17th, it has been that same tempt