When to go to the hospital update

Mom • My name is Raschel. I`m married and have a wonderful 4 year old son and a beautiful rainbow baby girl born nov 2016.
I recently made a post about being 4 weeks pregnant with aches and pains all through my body, specifically in the lower back/legs area. I decided to call my Drs emergency line and the nurse said I should come in and get checked out. When I got there and talked to the dr he was a complete jerk. He acted like I was waisting his time and was only out for drugs. His tone changed a little after my urine test came back "clean". 
Also I decided to do a little research and found that some women get aches and pains when they are pregnant with their second baby. Has anyone experienced this in the first trimester?