How to Tell if Your Snapchat Message Was Read
On the Snapchat Chats page, look for the outline of a blue arrow to the left of a chat message you sent.
Open the Snapchat app. It's the white ghost on a yellow background. If you aren't already logged into Snapchat, tap Log In and enter your username (or email address) and password. Swipe right on the camera screen. Doing so will open the Chats page. Look for the outline of a blue arrow. This icon will be to the left of the chat you sent. If the arrow is entirely blue (not just an outline), your message has been delivered but not read. 
Open the Snapchat app. Swipe right on the camera screen. Look for the outline of a blue arrow. 