Sakit pinggang memang sangat common masa pregnant, especially around 28 minggu ni when your bump is getting heavier and your body is shifting everything around. A few of my mum friends had this jugak, ada yang hilang sendiri after a few days, ada yang bertahan sampai delivery, so it's pretty normal lah honestly. That said, kalau sakit tu terus bertambah, or kalau ada contraction-like feeling or bleeding, better check with your doctor cepat cepat just to be sure semuanya okay dengan baby. For now, try rest dengan bantal support under your bump, and don't stand atau walk terlalu lama, lepas few days boleh lah assess better whether it's just the usual pregnancy ache atau something else. Jaga yourself, mama!