Sayang, dengan risiko yang ada (rahim boleh pecah), jangan tunggu, call your doctor or go to hospital sekarang juga untuk check. Better safe than sorry, especially dengan condition mu. I know a few of us dengan high-risk pregnancies had similar cramping at that stage, tapi since your case is different, the doc needs to assess you properly. The combination of the cramping, the back pain, dan the pressure down there needs professional eyes, bukan just mum friends' experiences. Please don't delay this one, okay?