Hello dear, I understand your concern. Iam sorry for your condition. In my opinion there are various causes for pain abdomen in pregnancy like muscle cramps,preterm pains,any abdominal conditions like bowel disturbances,any urinary tract infection(UTI) etc. The preterm pains are associated with tightening of abdomen along with cervical changes. The bowel disturbances are associated with loose motions or constipation. UTI might or might not be associated with urinary symptoms. The muscle cramps, ligament stretch have only pain with no associated symptoms. As you said all the reports are normal I hope ultrasound and urine examination are normal. So as your doctors said it might be muscular pain or ligament stretch as there is just pain. Some non specific pains tend to start in pregnancy which subside spontaneously before or mostly after delivery. So relax.Avoid stress. Take adequate fluids upto 3 litres per day. Take panadol for pain. Hope this helps . Best regards...Dr.Srilatha