Ted here from Shopify, thanks for posting your query!
When you first connect a domain to Shopify, it can take 48 hours for the SSL certs to adjust/activate. If you're still seeing a pending error, could you share the domain with me here and I'll take a closer look? More info regarding domains can be found here if you would like to take a look.
How are you finding Shopify so far? If there is anything else I can help you with, please let me know, I'm happy to help!