🚨🚨 Need help🚨🚨 so I have a question about using an electrical breast pump. Will it work properly if the shield is a…

🚨🚨 Need help🚨🚨 so I have a question about using an electrical breast pump. Will it work properly if the shield is a little too big? The standard size is 24mm and according to the size of my nipple I need a 19mm. I got my pump through my insurance and the smallest size this brand has is the 24mm. It's my first time pumping. I'm currently doing both formula and breast milk but I'm trying to just do straight breast milk. Thanks in advance.