First ultrasound 6 weeks 2 days

So I had my first us today! Everything looked great. Although, since I am early the doctor said baby's heartbeat was a little slow but that it's normal & not to worry! He said by next week on my next us it should be a lot stronger! I had a miscarriage back in September so I'm all paranoid! Fingers crossed everything turns out good & it's just slow cuz I'm early . xoxo!