Does just a 30 min walk count as exercise? Also, if a pedometer app like Google Fit says I have walked 30 mins throughout the day but not consecutively, does that count?

Absolutely, this is a start small but a start if you want you could add a 5 min yoga practice in the morning as well thats how i started out.

A 30 minute walk is exercise if done consecutively. If not, it means you are not getting enough exercise in a day. In an average persons day, you should be walking 1 to 2 miles a day, not consecutively. If that is not achieved, take a 30 to an hour walk at your pace.