Sayang, dengarkan, kalau baby mengeras kuat and ada sakit kat placenta area, especially if tak boleh tidur dari semalam, please go to your doctor or hospital sekarang juga, jangan tunda. Better safe than sorry, kan?
This isn't something to wait and see, kat 18 weeks, any hardening + pain needs a proper check to make sure everything okay with baby and placenta. Your doctor kena tengok this today. Jangan risau, tapi jangan delay lah. Let me know how it goes, okay? Sending you strength