Salam! Ahhh sakit tailbone time pregnant is actually quite common lah, even early macam 10 weeks pun ada orang experience, hormones dah start soften ligaments and posture pun slowly changing even if perut belum prominent lagi. It's normal, tapi kalau the pain is getting worse or affecting your daily life, better check with your doctor or midwife to rule out anything else and get some relief tips (physio, prenatal massage, or just proper posture tricks can help!). Jangan tahan-tahan jeee, especially since you're just early in your pregnancy, banyak lagi yang kena tahan sampai delivery, haha!