Sayang, perut yang keras dekat 37 weeks tu normal sometimes, banyak Braxton Hicks, tapi since baby is transverse (melintang), I think it's better you go to the hospital now rather than tunggu until Wednesday, just to be safe. They need to check if everything is okay and monitor the position, especially with the hardening. Jangan risk it lah, better to go in and get peace of mind. Let me know how it goes!