That is perfectly normal. I do it all the time. Every time I get a new picture, I replace the old sonogram on my fridge. I still can't believe I'm carrying this little one inside of me an dim almost18 weeks now
Wait until you get further along and see how your baby has grown. It truly is a miracle. I'm carrying my first child too. (Was told I wasn't able) so it's been that much more special to me. I'm now 20 weeks. Good luck momma!
How far along are you? My first ultrasound was just a sac. Not much to look at. I've had five ultrasounds so its cool to see the baby develop over time.
It is more than normal.. it allows you have the reality that you are going to bring an amazing gift into the world! Good luck. Congratulations.