Hi @Suzy_Howick welcome to Zwift forums.
You sure can. Log in to my.zwift.com and you can select the “Just Me” option on your Activity Feed.
This view allows you scroll back in time. If you click on a session, you can see the recorded data.
If you happen to use Strava, Garmin Connect, or another third party platform and a particular session is missing on that end, you can manually upload that session. Here’s how.