My last period was on December 20 last year, but it was just light and brown. I have irregular period. I had HPT last January 7 it was positive, but the second line is faint. Then the doctor advice me to have TVU, so I did it last January 25, but they found no sac in my uterus . And, now my doctor gave me duphaston and folic acid to get my period. Is it possible that I m pregnant?