Linda Hazelton (24 Feb 2011)
"Birth pangs"

I am a certified nurse midwife. This indeed has approximated the process of labor as Yeshua said. But these "contractions" today feel like the labor contractions that are in the part of labor that changes the cervix from 0 to 5 to 6 centimeters. Also, the contractions from this phase produce more blood (due to cervical dilation). We haven't seen a lot of blood except in Libya where a 1,000 were killed recently.  (This would qualify as blood.

After that comes the phase called "transition." Those contractions are the ones that completely dilate the cervix and start to push the baby down into the birth canal. These contraction slow down but become even more intense. And since the "baby" is being also pushed down into the birth canal there is the added pain component from pressure.
So I would look for the "event contractions" to slow down but to become way more intense if it's going to follow the schedule of the real thing. Hard to imagine how they would be more intense!

Then transition is followed by pushing which lasts about 2 hours. Not as much bleeding and though the contractions are strong the mother is distracted by making every effort to push the baby out. This stage is characterized by exhaustion. Finally birth occurs. The head of the baby takes the longest and then the body just slides out within seconds.
If  anyone wants a more detailed discussion let me know.