Did I BD enough? Also, glow has changed the date AF is due 4 times. I'm getting frustrated & confused.

Linley • 23. Married. TTC #1.
Initially glow said AF was due the 17th. When I didn't start I deleted it from my month. Then it said the 21st. And again I deleted it. Then 23rd.. She didn't show now the 26th. Meh. Is this a good sign or is Glow doing this to everyone?