How can I determine whether a lead conversion was a merge to an existing contact or a new contact?

Hi Deepak,

if (lead.IsConverted && !trigger.oldmap.get(lead.id).IsConverted) {

// process all merges that had to do with Contacts
if (trigger.newmap.get(lead.id).ConvertedContactId <> null) {

if(trigger.newmap.get(lead.id).Status == '-Merge Contact') {
// Existing Contact
// Delete all existing Status Trackers for lead
leadIdsToDeleteStatusTracker.add(lead.id);
}
else {
// New Contact
// Get all existing Status Trackers for lead and migrate to new Contact id
leadIdContactIdToUpdateStatusTracker.put(
lead.id,
trigger.newmap.get(lead.id).ConvertedContactId
);
}
}

}

Thanks