First Ultrasound

I had my first ultrasound today. She said I'm measuring 8 weeks that's a couple days off what this app says I would be 7w3d. Saw and heard baby's heartbeat! After 6 misscarges it's such a nice thing. Of course I'm still worried but it's nice to at least know things are ok right now. I would post a pic but they gave me a disc not a actual pic.