Back pain management

So every month for the past year I start getting lower back pain before my period. Usually 3 or 4 days before. This month the pain started 2 weeks ago and I’m about 8 days late. I’ve taken tests and they are negative so I really don’t think I’m pregnant. But I am hurting. Does anyone have advice on what I can do to help with this pain? I’ve been on the heating pad but it isn’t helping. I just want to cry. 😢