First of all don't worry and relax,get a TVS ultrasound
as was advices to you or get a whole abdomen sonography
done. The causes of pain with nausea can be due to appendicitis
or small stone in the urinary tract
or ovulation or a cyst in the ovary. With the sonography and a simple urine test to rule out urinary infection might give an answer to your queries ,so get them done and consult your doctor for further advice.