Not sure if it’s from pumping so much or the early signs of Mastitis but my nipples and breasts keep randomly feeling like their being sliced, or I get random pains in my breast.

I started exclusively pumping about 5 days ago and have been pumping every 3-4hours for 15-30 mins each time. I used to just nurse off and on for hours but stopped from not producing enough and started pumping and giving her a bottle so I could kee an eye on how much she eats.

Any home tips for the soreness?