Wow I read that funny but I think I got the gist...
When I got pregnant, it was the begining of last july (personally I have the exact day pegged for the festive 4th) and where as my usual period came on the 25th, that month I had moderate bleeding on the 16th and 17th then nothing. I waited for the 25th hoping I'd get my normal period but when I didn't, I took a test and found out.
Also, it's common for moms and doctors to be a week or couple weeks off in the begining if they aren't sure of the exact date of conception. Once you get farther along, the way you belly measures and the size the baby measures is more accurate in pinpointing gestational age.
at 3:59 AM on Jul. 18, 2008