How Far Along Am I?

The first problem I encountered was trying to remember when I had my last period. I just couldn't. I looked back at the end of October, for clues on the calendar that might remind me...was I on my period at Monica's party? at our Halloween party? I still can't quite remember so I'm going to guess and say that Oct. 26 was the first day of my last period. It's as good a day as any. I also figured out why we weren't getting pregnant in those months before our Turkey trip. I probably ovulate really close to the end of my period. This was true of our first conception, and is true of this second one. I wonder what my doctors will make of that. Does it matter if my baby is 1 week ahead in existence from a normal pregnancy?