When i registered for Express entry, i had 2 years previous working experience and 5 months on my new Job. So i only used 2 years working experience to apply since the 5 months wont necessarily count.I didn't make mention of the new job at all. While in the Pool, i gained a year working experience on my new Job a couple of months later and i had to update my profile and added the extra one year work experience. Do you think suddenly adding this one year experience on a new job would be a problem?