Emily - the IC OPKs are pretty good. I would just say that if you get a nearly dark enough line, back up that test with a ClearBlue smiley as an IC nearly-as-dark line can sometimes be a ClearBlue positive. This is what I've always done, so I end up only using around three of the expensive digital tests each month and around fifteen of the ICs. You need to test more than once a day (otherwise you can miss the surge), and do not use FMU for OPKs, so for example, test maybe at 11am and 6pm.
A little update from me... I have refused the early 'reassurance scan' they wanted me to have next week and my midwife is going to instead organise my dating scan for 11 weeks. I have to say though, I can hardly imagine getting that far. I feel quite convinced this pregnancy won't result in a baby. I don't feel anxious or particularly negative about it, just matter of fact and a bit resigned to it. It's horrid the change in how I feel about being pregnant this time compared to last time when I was naïve and jolly!
Crossing fingers for everyone that we have some more thread BFPs soon 