I know exactly how you feel - I was the same when it happened to me. And even though everything turned out fine and good, a part of me still feels that way. I think I was expecting the worse and when I had my appointment and everything was fine and we heard the heartbeat etc. the whole experience went over my head. I was just shocked. I'm now looking forward to my appointment tomorrow where hopefully I'll be able to enjoy it a bit more.
Also, don't forget that these hormones are all over the place. I don't know about you, but after trying for a year the get pregnant I'm surprised how low I am feeling most of the time and I know it's down to hormones which doesn't help with the worry etc.
Glad your spotting has stopped. I'm sure that's a good sign. It sounds very similar why happened to me. Thinking of you and keep us updated xx