5 weeks

I’m measuring at exactly 5 weeks with ultrasound and HCG levels. I went to the ER and they said that I have a gestational sac but no fetal pole. I’m looking stuff up and it’s saying they you can’t see a fetal pole till 6 1/2 weeks. Can any one ease my mind. I just had a miscarriage in June and i cannot go thru another one. Please help. I’m 5 weeks 0 days.