Hi there.
We are in the same situation as you - we have also just been matched with a little boy.
He is lovely, and we had a good long meeting with his SW, who really brought him alive for us. We were very excited, and it was an all round 'yes' at the meeting.
Then they sent us a little video of him and it actually made me wobble about our decision. I don't really know why exactly - his voice wasn't how I'd imagined it (different accent to us), and I didn't feel the instant 'Aaahhh' connection I that I was expecting. So I had to sleep on it, and I'm fine again now! I think I just needed some time for everything to sink in.
Adoption is so different to pregnancy - you don't have 9 months to grow attached to this little being. You don't have helpful Mummy hormones whizzing around your body. You are shown a photo or video, and there is some weird expectation for you to fall instantly in love (probably that we put on ourselves), and I believe that often the reality is different!
A week on, and he is on my mind all the time and I already feel fiercely protective of him, and we haven't even met yet. A connection really does take time to grow.
It's a strange and unsettling part of the process, and I totally sympathise.