Worried mommy to be

Hello mommies! I previously had a missed miscarriage-5/2/19. Got my first period 15/3/19. On 29/4/19 took a pregnancy test positive. On 17/5/19 went to a gp for scan doc say kantung nampak kosong ?. I should be 9 weeks+ but scan shows 5 weeks 5 days. Doctor asked me to come back again after 2 weeks. Anyone had same experience?