How to account for no period on Glow

Hello everyone.

I got Mirena install in 3/2015. It told and understood that after my body adjust to Mirena my cycle may disappear, get lighter or heavier.

Well now it's been 2 weeks since my cycle was suppose to start. No pregnancy symptoms and 3 negative pregnancy test. Guess I'm in the bunch of women whose cycle stops. But, how do I account for this on Glow? Do I just keep hitting "period is late"?

What have you ladies who have your cycle disappear due to birth control done to account for the lost of a monthly cycle?