Zofran & Constipation

Oh the joys of pregnancy... I’m on Zofran 4x a day for Hyperemesis Gravidarum and unfortunately one side effect is constipation. I think I’m to the point where I need to take something. I feel like I took milk of magnesia with Zofran in my last pregnancy and it was fine but that was awhile ago and I can’t remember 100%. Does anyone know of a laxative or stool softener that is definitely safe to take with Zofran?

Thanks!