Getting nervous

I have my appt for an ultrasound a week from today and i am so incredibly nervous and anxious. I had a missed miscarriage in January of 2011 and then had my son in 2014 and we've been ttc since he was just a couple months old.. Because we knew it wouldn't happen right away if at all. We both accepted that we wouldn't have any more kids. Well the night before my af was due i had a couple drinks and felt off and took a test and got a BFP. We want this baby so badly, and are both so excited but i just cant shake this feeling that we'll go in for the U/S and something will be wrong. Not really a point for this post.. Just a vent i guess. I don't want to say anything to my husband ans upset him.