Primoult - N is a norethisterone
which is given to regularize excessive irregular bleeding during medicines.
Normally these drugs are given for some months after which periods become regular. This is also a contraceptive
so you cannot conceive while taking this drug or you need to stop this drug immediately if you become pregnant and contact your gync.
When your periods become regular, it is easier to find ovulation day and get fertilized.
You havent given your husbands sperm count
level . but 4 months is relatively short time to get pregnant..
Please both of you take good balance diet, have a stress
free life and regular relaxed intercourse.
Iam sure you would be pregnant soon.