Talk to Gynecologist on Pregnancy Related

My doc prescribed me duphaston for periods she said take duphaston 5 days 2 time and after 5 days periods will come but it came on 11 day it was 25 April and then clomitab gonadil f was given then again duphaston now i took duphaston on 15 may but yesterday 25 may was my due date should i wait more days because last time it took 11 days to come periods or should i take pregnancy test? Ps i have light lower abdomen pain and near uterus from 4 5 days and last week i have pain in left lower abdomen pain