I would like to pump my milk occasionally. Will this hurt my supply?

I just got the Medela Swing pump for occasional use. I want to be able to slip away from the baby for a few hours here and there. If I pump my milk for someone else to give my daughter a bottle or two while I am gone will this hurt my supply? Because I won't be pumping while she is eating, will my body think that she is weaning? The majority of her feedings will come from the . I don't want to jeopardize my ability to exclusively feed her.