Breastfeeding and birth control

Hi mamas,

I am currently 10 weeks pp. During my 6 week check up my doctor prescribed me birth control pills without 1 ingredient since I’m breastfeeding. Since I’m on the pill me and my husband are not using protection. Once I started the bc I got a period within days and lasted a normal cycle now for the month of November I didn’t get a period. Is this normal to experience? Should I take a test?

Thank you in advance!