So, Shelly Overlook asked for more details, so I'll tell you the story of how I found out.
Last Wednesday, I had my annual exam at the gyno. I was worried about the scheduling because I realized (AFTER I scheduled the appointment, natch!) that it would be just after my period was scheduled to start. I figured I would play it by ear and if it started, I'd call the office and see if they wanted to do it anyway. But it didn't start. So I went on to my appt., not expecting anything. But I asked the nurse, while we were doing blood pressure and all that boring stuff, if she would mind doing a pregnancy test while I was there. I explained that my period was only two days late, so that probably it was nothing, but still. Doesn't hurt to check, right? So she did the urine test and it was....well, not definite. (Y'know how there's one line that means it worked, and then if you are, there's a second line? Well, there was a second line that was so faint that neither she nor I was certain it was there.) So they drew blood (apparently, with a dull spoon - I swear, my arm has never bruised this badly from a blood draw. There is a two inch bruise on the inside of my elbow.) They went ahead and calculated my due date as September 28th and did all the prenatal blood work. Then, I had to call on Friday afternoon to get the final results. I found out for sure at about 4:30 Friday afternoon.
We told our parents last night at a dinner for Rock's birthday. I said, "Well, in addition to Rock's birthday, we have some news to tell you all." Rock's mother turned and looked at me and said, "When's it due?" I just laughed.