I would like to suggest:

While I am in TTC mode it would be great to see the estimated birth date if TTC will be successful in this cycle.

This has the following reasons:

Since we are in TTC there were some months were a birth is not favourable. For example: in September my husband always will be work a lot of more than normal and we won't never be able to celebrate birthdays together. So we want to know this cycles and will use a protection to get not pregnant then.

Currently we use another app for that and it would be great to see this in Glow directly.

Thanks for reading :)!