This screening tool is very well researched for both postnatal and prenatal use.
It is recommended you use it twice during your pregnancy and at 6 weeks, 12 weeks and perhaps twice more during the first 12 months postpartum.
Please note that while this is an excellent screening tool, it is not a diagnostic tool. If your score is higher than 13 or if you respond positively to question 10 it is highly recommended you seek professional help from a mental health professional. If in doubt always consult your family Dr for a referral.