Talk to Gastroenterologist on Constipation

Aoa, my wife is facing problem of constipation but uska pait bi pholna start hogya ha or abi pregnancy ki koi symptom show nai hui confusion is contipation ki waja se itna pait kase phol ra ha? or kia yeh symptom pregnancy start hone ki alamat ha ya constipation ki waja se ha? guide me in this situation.