WordOps has a cron job that runs every night to check if it's time to renew. It renews every 60 days (the acme-sh default).
If you do site info yourdomain.com it will tell you how many days are left on the certificate. If it really is only 7 days then the renewal is not working for some reason. You can try running the cron job from the command line to see what is erroring. Or just enable logging in this file /etc/letsencrypt/config/account.conf (and wait for the cron job to run).