The easiest way to think of the 'fifth trimester' is the time after the fourth before your period starts.
This is to serve as a gentle reminder that you are forever postpartum. You might not be in an acute phase but the process of Matrescence is well on it's way. You are still healing and acknowledging the process will serve as a way to give yourself a bit of grace. The whole world is different now and especially if this is the first baby, the shift can take lots and lots of time.
The 'new normal' is full of ups and downs so