I've been told you just have to take them out when feeding/ pumping, but otherwise you should be fine. I plan on breastfeeding and I still have my rings in, and I will be 32 weeks on Saturday. I also don't want them to close. It might depend too how long you've had them pierced, I've had mine for over 5 yrs, but I'm not sure if that matters.
Maybe it might relieve some presure have extra holes in your nipples??