A lactating mother should avoid all types of oral contraceptives.
Nutrition in Practice - Encouraging Successful Breastfeeding

Question

Quizplus · Accepted Answer

While certain types of hormonal contraceptives may affect milk production, there are other options available that are considered safe for breastfeeding mothers. It is important for lactating mothers to discuss their contraceptive options with their healthcare provider. While some oral contraceptives may decrease milk production, many types are safe for lactating mothers to use. It is important for a lactating mother to discuss her contraceptive options with her healthcare provider to determine the safest and most effective method for her individual situation.

A Lactating Mother Should Avoid All Types of Oral Contraceptives