General rule of advice - always make sure the sharp end of anything is not pointed directly at you when using it.

Shit that sucks! But are you sure you bought a pumping bra? They already come with holes and some even have extra cloth segments you can add in the center in case your nipples are wider apart... If you need to cut the second hole still just draw a circle around your nipple while wearing it and then cut it after taking it off your body. For now, nipple cream for pain and healing 😭