Severe Abdominal Pains

Patient: My wife has been getting severe abdominal pains.. she is 13 week in her pregnancy, we are very concerned on what is happening, the pain is to much.. we went to ER, the doctors did blood tests, urine tests, utrasounds, they found no problems, no ifections, and baby seems to be doing fine… the pain has be going on for the last three days and no signs of getting better, what should we do ?