Hai! Sakit kepala dan pinggang memang common 5 weeks, tapi sebab pregnancy hormones naik dan posture berubah, tapi sebaiknya mention kat doctor pasal frequency dan intensity dia, just to be safe ye. Aku dulu pun sakit pinggang teruk, a few of us pregnant mums tried pakai maternity pillow and it helped, plus banyak stretch, minum air banyak-banyak. Hopefully it gets better, but do check in with your gynae k, especially if it's constant sangat!