So according to speccy my laptop motherboard has 1 available pci-e x16 slot and 3 pci-e x1 slots. Now the x16 slot is where the wireless adapter is and there is definatley not 3 more slots. I would take a pic of motherboard put I have no way to take a photo.
Laptops are different animals from "normal" motherboards. All depends what chips were installed. The manufacturer can install any chips even though parts of it are not used.