Hay, totoo yan! Sa 36 weeks, normal na yan, yung ligaments mo nag-stretch at nag-prepare na ang body mo for labor, kaya parang may come-and-go na sakit sa balakang at tummy. A few of us moms felt the same thing around this time, and honestly it's just your body doing its thing. But since nawawala at bumabalik lang, I'd still suggest you mention it sa OB mo sa next checkup just to be safe, lalo na if suddenly it becomes consistent or mas masakit talaga, better to rule out any concerns, di ba?