Polyclinic does not do ultrasound or blood test to confirm your pregnancy that's why they referred you to your preferred public hospital. But normally during the early stages, it is normal to feel mild cramp like menses but shouldn't be accompanied or have any bleeding. If you worry, you may go to your referred hospital's A&E to have a check.
go to private gynae faster esp if u haf cramp. 15 mar is 2 week away. i feel its vry long.