There currently is no way to view your pending invites. For now, just keep a personal record of who you have invited, and if a week has passed and you do not see that person in your network, then simply follow up with them again, perhaps with a different message.
Once they have accepted your invite, downloaded the app using your referral code, they should appear in your network. Here's how to check:
Open your Fluz App
Click on the Menu Button (☰)
Under Connections, click "My network"
You should see all your invites under "My invites"