I feel I've been in a slightly similar situation to you. Before we knew my carrier status, DH and I chatted a little bit about what we'd do if it turned out I was a carrier. Our thoughts were we could adopt, go with the IVF and do PGD, or use donor sperm. Like you, the thought of undergoing the testing while pregnant and then trying to make a decision was too much to even consider.
In the end we took it step by step. We didn't plan any IVF cycles or even really do any investigation into what was involved in IVF until we knew what we were dealing with. So my advice to you would be to try (*hugs* I know this is easier said than done) not to think too much about what the next step is until you know what you're dealing with.
Also, I wanted to say that during the counselling we did as part of the IVF treatment I learned that you have a higher chance of falling pregnant during an IVF ICSI cycle than you do naturally. Of course this depends on your age and if you have fertility problems or not, but from memory I had a 25% chance of falling naturally and 50% of falling with IVF. As I mentioned we did the IVF due to male fertility issues, and apparently I checked out ok. FWIW we got lucky on our first cycle, so you never know (we were preparing ourselves for years of trying). Emotionally, I think we felt differently because IVF was our first port of call when TTC, it wasn't after years of trying and I think that made it emotionally easier for us to deal with. I always felt very out of place in the LTTTC forum because we weren't long term at all.
Sorry to waffle on a bit, but I just wanted to add in some hopefully positive thoughts. I hope you can find some good answers from your doctor or genetic counseller whatever the outcome of your blood test is. *hugs*
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