Brief Answer:
very low chances of conception
Detailed Answer:
Hello mam I understand your anxiety.
Primolut N is not a contraceptive though so you can ovulate and conceive but usually endometrium is not in a good state so chances of conception and healthy pregnancy are low.
Its better that you take it lightly and wait for your periods to normalize.
Once everything is alright then do regular intercourse on alternate days from day 10 -18 of your periods as there are good chances of conception in that period of time.
Take care.