Back labor?

Jordan • 21, Married, Mama of girls👑

Can someone tell me what back labor feels like? I’ve been having consistent hip/lower back/tailbone pain all night worse than normal plus some nausea. I can’t sleep or lay down and a heat pack is kinda helping but not really. I labored extremely fast with my first and would like not to have a car baby this time because I couldn’t tell between normal pregnancy pain and beginning back labor. Anything is appreciated.