Ultra sound 6 weeks

Went into my early ultra sound today thinking I was 7 weeks and 2 days but I got told I was only 6 weeks and she couldn't hear the heart beat. We have been waiting 3 years for this miracle baby I just pray everything is ok. But now I am super nervous and they already had me do a rush blood work today and a repeat on Friday (not helping with my nerves). Prayers this way please ladies and any advice, with my daughter I never had to go thru this but I think I never had the early ultrasound done .