I kow exactly where you are coming from!!! I had the same thing happen. M/C in DEc and then fell preg straight away (against docs orders). I was like you not really believing it or being excited but secretly hoping. To a point they are irrational but you can't help it!! I checked for bleeding too and it happened again!! I bled for nearly 3 weeks and was always freaking out and feeling sad. But it all went well and now we have our gorgeous DD who is 6 months. I'm not saying it will be the same for you but good things do happen! So far you sound like you're going BEAUTIFULLY - put your mind at ease and ask doc for dating u/s. It might be too early to see anything but it might not.. will put your mind at ease.