sunnydisposition
HI there...
Here's what I am feeling... you are not "wasting precious time" at all, nor do i sense that your grief has you stuck in any way. I feel you are dealing with this loss in a healthy way, and processing it in your life in the best way for you....
The reason some people get visits and others don't is very individual... my sense is that, as you suspect, you had "too much going on" with your pregnancy... along with the hormones racing and all the other things you were juggling in your day to day life, pregnacy is very stressful on your body...
your mom and your dad's friend are in another stage in their lives, where their days are a bit more tranquil and they are more "open" to such expereinces.
you will receive visits... you may notice funny things with your electricity, lights or tv turning itself off or on, phone ringing and no one there... these are also signs that he is around
he is around you all the time, and often stands near you when you are in your special chair, is what i see, especially when you are sitting with your son
hope this brings you some peace