@ Blueberry1 12 DPO is early for a standard pregnancy test to work, isn't it? I thought they were more reliable at 14 DPO. Sorry you got a BFN - disappointing is a very mild word to use for that situation. I am so glad that you have other chances, though. Still keeping my fingers crossed for you tomorrow.
Thank you both for your support. Today, Death's Sweet Embrace no longer feels like a top holiday destination, which is nice. Also, I can sleep on my tummy again, which I had to cut out about a week-and-a-half ago because it was too uncomfortable. Interesting. My plans today include feeling hungry enough to eat some food (I'll just give that a bit more time...) and getting rid of these cramps again.
I've ordered some more sensitive pregnancy tests and a basal thermometer (all quite cheap on eBay, although I obviously don't yet know how effective they are!), so I'll hit this month with a bit more information available to me.
Now I'd like to make some book recommendations. A lot of the conception and pregnancy books out there say things, but they don't really explain where they got their information. I don't find this entirely useful. I've had a couple of books out of the library which actually look at scientific studies, and give really useful information about the whole process.
The first book is "Expecting Better", by Emily Oster. She is American, and I reckon she wrote the book for an American market, but the version I'm reading is mostly UK-specific (what I'm saying is that if you buy it from Amazon USA, it might not be a UK-specific version). The book has loads of information about everything! Its conception and 2ww sections are particularly relevant to me now, and the whole thing has made me feel a lot better-informed.
The second book is "Bumpology", by Linda Geddes. This starts from after conception, and so isn't quite so useful for me right now, but it has put my mind at rest on a few aspects of the 2ww.
They are both definitely worth getting out of the library, particularly the first one. I might actually buy them for myself.