When I first made the ticker, I was using the EDD I'd gotten from an IVF website. After all, I thought, no need to bring my LMP into this when I know *exactly* when I conceived, right? Egg Retrieval was CD 13 for me -- the closest I've had to a "normal" cycle since I started charting -- but the protocol says it's CD 14 for all date-figuring purposes, so I went with that.
And then I joined up with the OB practice. And they only wanted to hear about when my last period started. (Let's not even get into how the dang thing had the spottiest start ever and I wasn't even sure when to start stims and I ended up calling the Baby Factory in a tizzy, 'kay?) And they decided my EDD should be 3 days later than what I'd been thinking.
After some dithering, I've decided to go with their date. The word on the street from the lezzie-mamas and others who know for darn sure what day they conceived, thank you very much, not as if we're just casually throwing spunk up in our business, is that having a date that's a little later than you know is right is better than having an early date -- that way, you buy a few days' breathing room before people start pushing pitocin on you for being overdue. (I was doing all this reasoning before the specter of pre-term labor was raised at the nuchal, understand.)
So I've adjusted my ticker accordingly, even though it feels wrong to see the week number turn over on the wrong day of the week. (Those who know me from the IVP may notice that I left that ticker alone as a compromise to my view of truth.) I put off changing it for weeks, because I didn't want to lose ground in the struggle to get past the time of highest miscarriage risk with my sanity intact. But I'm gradually forcing myself to practice belief that this bunny-bean will stick around, whether or not I remember every superstition I've invented.