Thanks for the query.
If you are having regular periods previously, there is some possibility for pregnancy
if you ovulated on around 12th day of your cycle.
But the delay in periods could also be due to hormonal
imbalance due to perimenopausal age group.
As you took primulot tablets for one month after that, you wait for one more week possibly by that time you will get withdrawal bleeding.
If not you once check for pregnancy by urine pregnancy test kit or go for ultrasound
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429