Aiyo, 13 minggu pregnant memang lagi heavy kan, especially kalau ada sorang anak yang kena jaga lagi, body aching after housework tu normal sih, tapi jangan push yourself too hard lah! A few of my mum friends masa pregnant second time cakap depa pun rasa sakit-sakit lebih sebab body sudah pernah stretch before, and hormones jugak kena bekerja extra keras. Try rest properly, mandi air warm, and maybe ask your husband atau family to help dengan housework first trimester ni, baby still developing, you need to take it easy. Best you mention these aches to your doctor at your next checkup, just to be safe, especially since you're juggling a 6-year-old at the same time!