Helen Baxendale, who played Emily, became pregnant between seasons 4 and 5. Her character had to be written out of the series much earlier than was planned as she was unable to continue traveling from England.
In her last few appearances, Baxendale is wearing heavy clothes to hide her pregnancy.
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Things You Didn't Know about F.R.I.E.N.D.S
FanfictionHere are some mind-blowing facts that you probably didn't know about F.R.I.E.N.D.S