That's weird Shayne, I had two losses also and feel the same way about the twins!
We found out at 5 weeks to the day. My beta's were super high and the nurse called and asked me to come in and check for "placement" which I've never heard of and we did not do when I was pregnant with Cole (same fertility clinic). When we went in we had the nurse that told me on the phone that the chance of having mupltiples that cyce was "less than 10%, I wouldn't even let it be a fleeting thought in your mind" because we only had one mature follicule and one that was only 16mm and didn't do a trigger shot or an IUI. I had told her we would sit that cycle out if our chance of twins was higher than normal.
Anyway, the nurse, Matt and the RE could see the screen and they were all silent, Matt had a really weird look on his face. Then the RE said "Well, let me show you what I see." and he swung the screen around. He said "I think I see two....yup! There's a clear shot of both of them, twins!" The first thing out of my mouth was "NO. We have a two year old!" Like that would change anything
At first we were both really shocked. The nurse told us they were measuring exactly the same so the chances of losing one was very low. The idea just took some getting used to, but now I really can't IMAGINE having one without the other! They're so much fun!!
It's neat to think back to the day we found out it was twins. It was the strangest moment, I can't even discribe how much everything changed in our lives in an instant!