The events of the pregnancy announcement, pregnant belly, and new full body CGs of the main party members during the time skip have been in the works for the last few updates. Some characters are already done and the rest should be finished before the end of the year.
Yes, if you haven't played for a year than you definitely missed some new girls.
There is a change log included in the game files. Maybe scroll batch to the latest update you remember playing and check what has been added since. It should be a lot.