Pumping hurts and idk why

Hey guys so I’m a FTM 39 weeks pregnant and I just got my motif Luna breast pump in the mail. I wanted to see how it works so I put it all together and I wanted to pump my nipples maybe about 3 mins just to kind of get the feel of it. There’s 2 sized flanges and they BOTH hurt it feels like someone is pulling on my nipples and I hate it. Am I gonna get used to that pain? Is that something that ppl adjust to? Because it’s definitely super uncomfortable. Maybe I should try adjusting the suction level? Thanks mommas! 🫶🏼

ALSO I WAS ONLY PUMPING TO LEARN HOW TO PUMP but I wasn’t aware about hurting because I am pregnant. Thanks mamas ❤️