I think, from the look on Rachel's face, it must be her. Would have to be either Ross or her assistant Tag--they didn't break up that long ago. Tag would make more interesting storyline. Doubtful after the Vegas drunk wedding fiasco Rachel would sleep with Ross.
Chandler's mom and Monica's mom are Menopausal and would not be getting pregnant. Plus, would not explain why it was in the trash in Monica's bathroom when Rachel claimed to have emptied it the night before, AND Rachel was staying with Monica for wedding. Also, Chandler's dad is a transvesitite--the marriage broke up because he likes men.
Possiblity-- that Pheobe mis-read the test, that is was actually Monica's but it was negative. or it was Rachel's and negative but part of her wanted it to be positive.
I loved Monica's dress. Totally reflects the styles popular in L.A. right now for wedding dresses. Simple and elegant. I didn't like her hair, seems like she would have done something special to it, not worn it the same old way. I liked the bridesmaid's dresses too and even Joey--his screwups were totally in character for him AND a result of the intense emotions he was feeling being the one to marry two of his best friends.

Amy
[This message has been edited by amycat412 (edited May 18, 2001).]