What can I do for abdominal pain during pregnancy?

Get bowels moving. Stay on schedule for routine check ups with your OB doc, and get your bowels moving. A bowel regimen may be needed, discuss with your ob. Constipation and pelvic congestion are common source of discomfort during pregnancy.
Depends. I need more information. What you do depends on specifics of the pain and duration, etc.
May be positional .. I would discuss this with your gynecologist as there may be several conditions that should be evaluated first with possible ultrasound option to making any recommendations.