Ob-Gyn questions? Ask a gynecologist online.
When was your last bowel movement? I would start with daily Miralax until you have results. There is no specific time frame for going to the doctor for constipation as some people only have BMs every 1-2 weeks as their norm. If you are having pain that is not tolerable, then you should be evaluated. I would start at a clinic visit, though. I would not go to the hospital right away.