HELP HCG LEVELS

So I went in for my first ultrasound at 6 weeks (thought I was farther along) two days prior had mild spotting. During ultrasound they saw the yolk sac and fetal pull. Did HCG 48 hours apart to make sure no miscarriage from spotting. HCG went up from 355 to 407 but did not double. Was told to be prepared for miscarriage. It has been about 10 days with mild spotting but nothing heavier. Has anyone experienced this? I still have mild pregnancy symptoms (which did not have bad symptoms like my first pregnancy). I’m wondering could I still be pregnant ?....