Gosh Nutty what a rollercoaster! I can imagine this must be so tough, but I've seen lots of positive stories - either of the weaker one catching up, or even if it didn't make it, of not affecting the other embryo at all. So I really don't think you need to worry about it (though of course that won't stop you!). I'm sorry the midwife wasn't more reassuring - some are just not very good at that!
Shell I'm trying to remember what we did during the 2ww, it seems so long ago! [TMI warning:] I'm pretty sure we DTD once, but it was very uncomfortable and not much fun - partly because it felt like he was hitting my cervix (I get this the days leading up to my period, so I was certain it was a bad sign), but mostly because those awful progesterone pessaries made it rather gross, and, strangely, made me very dry. So we tried once during the 2ww, once again just after the BFP, and then decided to wait until the 8 week scan before trying again. Very happy to report that it was much better after the scan with no pessaries, but still felt rather awkward. I think DH is terrified that our sex life has disappeared forever, as we've done it less than half a dozen times since starting treatment.... I'm not too worried - partly because I know that I'll be able to get it whenever I want it! But he doesn't have the same reassurance!
Whittle it's so hard these last few days, but hang in there. And don't worry about the brown CM, I had this too, it's old blood and doesn't mean anything at all. I've been reminded again of the benefits of a blood test rather than POAS at home - my cousin was also having treatment and was going to POAS but resisited and waited for the blood test instead. Just as well because it turned out to be a chemical pregnancy - she was so so glad that she didn't just POAS, as it would have shown positive, she would have been over the moon, only to discover a couple of days later that it wasn't to be. Now, of course, we're all hoping for a full on positive super-high levels of hormones for you in the blood test. Whatever happens, you'll want a reliable result. Best of luck!
Lil - I think once you're actually doing something it feels much better. I know I was over the moon when I was injecting because I was FINALLY doing something other than waiting. Plus you get checks every few days so you feel like you're getting somewhere.