<Tr> <Td_colspan="8"> <P> Everybody thinks Monica's pregnant, but her denial quickly shifts the focus to Phoebe, who takes the heat off of Rachel--who is actually pregnant . Chandler's shoes are slippery, rendering his dance lessons useless . Joey tries to impress a Broadway director . Ross dances with children to impress Monica's attractive, funny friend Mona, which leads to him getting injured quite a bit . </P> Note: This episode is dedicated to "The people of New York City" to remember the September 11 attacks . </Td> </Tr> <P> Everybody thinks Monica's pregnant, but her denial quickly shifts the focus to Phoebe, who takes the heat off of Rachel--who is actually pregnant . Chandler's shoes are slippery, rendering his dance lessons useless . Joey tries to impress a Broadway director . Ross dances with children to impress Monica's attractive, funny friend Mona, which leads to him getting injured quite a bit . </P> <Tr> <Th> 172 </Th> <Td> </Td> <Td> "The One with the Red Sweater" </Td> <Td> David Schwimmer </Td> <Td> Dana Klein Borkow </Td> <Td> October 4, 2001 (2001 - 10 - 04) </Td> <Td> 227402 </Td> <Td> 30.04 </Td> </Tr> <Tr> <Td_colspan="8"> Rachel won't tell anybody who the father of her baby is until she tells him . Joey tells Monica and Phoebe that a guy slept with Rachel a few weeks earlier, and left a red sweater behind . Phoebe thinks it's Tag Jones and arranges a meeting for Rachel with him . Ross and Chandler attempt to recreate the wedding pictures, after Chandler loses the disposable cameras . Monica opens all of her and Chandler's wedding presents . Monica, Joey and Phoebe find out that Tag is not the father of Rachel's baby . They're still pondering the mystery when the red sweater is spotted in front of them and retrieved by its owner: Ross . </Td> </Tr>

When does rachel find out she's pregnant