Sayang, that vacuum feeling bisa jadi banyak things, baby bergerak, ligament stretching, atau memang contractions. Tapi at 33 weeks dengan feeling mcm tu, better you call your doctor or midwife today, okay? They need to check if it's Braxton Hicks or something else. A few of us mums experienced similar feelings during pregnancy and after checking, semua okay je, but best to get peace of mind from your healthcare provider directly. Jangan tunggu lama-lama, call them now!