How do I know if I'm passing a kidney stone? I'm having SEVERE constant pain in my lower back, mostly on the left side, & it's just getting worse by the hour. I've tried heating pads & Tylenol but nothing is helping the pain. I'm 30 weeks & I just figured it was baby boy moving around but it started getting worse & worse. & I have no way of getting ahold of my doctor. I have an appointment tomorrow but if it's not a kidney stone & it's something more serious, I don't wanna wait till tomorrow. Please help because I'm in a shit ton of pain 😭😭😭