Alamak, those symptoms could be a mix of things, some normal Braxton-Hicks contractions (perut keras tiba-tiba), some stretching pains, but the sharp pain at the bottom and the numbness feeling (nyilu) better check with your doctor just to be safe, especially if it's happening more frequently now. A few of us in my mum group had similar experiences close to delivery, but everyone's different, so don't want you to worry alone. How far along are you now? If you're already near your due date, might be worth calling your gynae clinic to confirm everything is okay lah.