It probably doesn't matter. If you sold the house and moved because of a job change, you are still allowed an exclusion of the capital gain, even if you did not meet the 2 year rule. The Maximum exclusion ($500,000 married) is reduced for the time shortage. So, if you lived in the house 20 months, your maximum exclusion is 20/24 x $500,000 = $416,667.
That said, your old home is still you primary home until you establish a new primary home (or the old home is sold, whichever comes first). If you had only temporary living arrangements (e.g. hotels) April -July 2018, at the new job location, then your old home was still your primary home, during that period.
