I saw that on TV last night too. I've heard of that happening before as well. It's funny coz since about November, i've been really putting on weight for no reason and my stomach has grown outwards, and is quite hard, and i've been saying to DH that maybe i was pg, but it wasn't showing on any tests, and he's like 'as if', but last night i said to him, 'see, it can happen'. I know i'm not pg, coz i had a lap done in Nov, and they would surely have seen something then.
As for your question, i personally dont check cervical position, but i have read up about it in FF's FAQ and also in the 'Charting Handbook'. If you can't find anything on here (have you checked the front page also), then maybe you could check it out...(if you haven't already that is).
I'm about half way through my TTW too, so we must be due to test around the same time...
Bookmarks