Muscle pulls can take a while to heal. Go easy on it for at least a week before trying to work it again. It could easily take a month if it's bad. Not sure the doctor can really do anything for it, but not a bad idea to get it checked if you don't notice any improvement soon.
"In case you ever wondered what it's like to be knocked out, it's like waking up from a nightmare only to discover it wasn't a dream." -Forrest Griffin