From the article: PMS Problem:Why Your Back Hurts and How to Get Relief
Chances are if you've always had similar menstrual discomfort, it's nothing to worry about. But see a doctor if you're incapacitated for more than a few days a month or if you've noticed a sudden change in your symptoms. Meanwhile, you can ease the back pain with over-the-counter anti-inflammatory drugs such as ibuprofen, or with a warm bath or a heating pad. Avoiding foods that contain caffeine and salt can also help. And even though you have about as much energy as it takes to plop onto the couch, women who exercise regularly often experience less menstrual pain so keep up with your routine by doing some light cardio or these cramp-relieving yoga poses.
I wonder if it has something to do with all of the estrogen pills and progesterone injections I’ve been doing. Maybe my body isn’t used to the high levels that I was pumping into my body for weeks. Anyone else have these back pains after infertility procedures?