Need to the whole footage of the incident and the woman doesn't look pregnant to me.
All I see is (1) failure to comply with a lawful order (on several counts), (2) lose of vehicle control (she went over the curve), (3) endangering (crossing the solid white lines at the off-ramp when she started evading), (4) evading (when she failed to get off at the off-ramp and re-entered traffic on the main highway), (5) resisting arrest (failure to turn around and struggling when the handcuffs were put on), and let's not forget the biggy... (6) probable cause (when she failed to comply with the lawful orders of law enforcement right off and attempted evading).
There's at least two police cars on the scene the moment she stops because there are 3-4 officers immediately present.
We do not know if the woman is wanted for something and if that's why they are chasing her. As far as we know she may have just murdered her husband.
If I was a acting law enforcement officer and had ordered someone turn around several times and they failed to comply I would have drawn my firearm and covered her, or the van (which is where my firearm would initially be pointed), also.
Note: The other officer did not have his firearm drawn.
We do not know if the woman is wanted for something and if that's why they are chasing her. As far as we know she may have just murdered her husband, robbed a bank, knocked over a convenience store, etc...
As for putting her on the ground the way they did each state, even cities, handles things differently.
The best advice is to do what the law enforcement officials tell you to do and file a law suit later if you feel you were treated poorly.
So unless more information is provided I'm siding with Ironsights on this.
*****SMILE*****
https://www.youtube.com/watch?v=wQzUCO7rG0M