Sayang, sharp stabbing pains down there at 33 weeks boleh jadi normal (ligament stretching, baby position, etc), tapi since it's sudden and needle-like, better you call your doctor or go to the clinic today just to check, okay? First baby maa, better be safe than sorry, a few of my mum friends had similar at that stage and turned out fine, but they all got it checked anyway. Don't worry too much, but jangan delay lah, just go get peace of mind!