Sayang, please go to the hospital or call your doctor RIGHT NOW, don't wait, okay? Sakit perut yang lain macam tu at 33 weeks perlu check immediately, better safe than sorry! A few of my mum friends had similar things and turned out to be something that needed urgent attention, so jangan delay lah. Doctor je yang boleh check properly and make sure you and baby okay. Jangan worry too much first, tapi memang kena go now ye? Let us know how you are!