Eh normal je sakit pinggang masa trimester akhir ni, sebab baby dah besar dan weight distribution berubah, tapi kalo it's getting worse, better check with your doctor just to be safe ya, especially kalo ada cramping atau symptoms lain sebab kat 34 weeks macam ni kita kena monitor closely. A few of my mum friends yang tengah pregnant juga complain pasal this, some tried prenatal massage atau maternity belt and it helped! Tapi jangan main-main, check with your gynae dulu okay, semua orang lain aman doesn't mean it applies to you. Take care sayang!