First time charting... help please!

Mimi • Baby boy born in April 2020 👶🏼 loss in 2021 👼🏼 rainbow baby coming in 2022 🌈

This is my first month charting. Could you help me figure out what this means? I have two questions:

1. Did I ovulate on CD19 or CD15?

2. Does my temp dip this morning mean AF is probably coming or could it just be a random dip? (It’s below my cover line 😬)

Any help is greatly appreciated!

P.S. my cycle varies between 28 and 33 days so I never really know when to expect it