Sayang, cramping dalam early pregnancy memang boleh happen, tapi since you're IVF at 6 minggu, lepas tu ada cramping even without bleeding, you really should call your doctor or go to the clinic straightaway, okay? Jangan delay. Early pregnancy memang unpredictable, and dengan IVF, your doctor needs to monitor closely. Cramping boleh be normal, tapi boleh juga be something that needs checking, only your doc can say for sure by doing an ultrasound or blood tests. Ring them today lah, don't wait. Better to be safe! Sending you lots of good thoughts.