when to introduce a bottle?

Zainab • 2 early MC, 1 baby and another BFP hope this is my second rainbow baby
My baby is almost 3 weeks old and exclusively breastfed. I want to start pumping so we can feed her with a bottle when needed but I'm so worried about nipple confusion. I love breastfeeding and the thought of her refusing the breast after introducing the bottle is giving me anxiety. So when is the best time to introduce a bottle? And how should I do it? Is there a certain feeding time I should start with?