Breastfeeding while pregnant

Felicia • Young , Christian + Married. Building a family with my best friend♥️ 1boy + 1Girl + 1 OnTheWay #mommyOf3Loading

I’m in my first trimester with my 3rd baby and my youngest is 8 months. She still breastfeeds many times daily and its running me to the ground, my breast are tender and she’s teething. It seems like she’s not wanting to stop, nor do I want her to lack nutrition because of my selfishness lol. Any other moms have tips to get through this ?