i have been on domperidone / pantaprazole treatment for gastric reflux for a month from 16th march to 16th april, my last period was on time on 4th april, my period is of 25 days, which was due on the 30th, i have not had unsafe sex , used comdom safely for the past 10 yrs. did a pregnancy hcg test on 29.30,1 as were negative. pl advised