Congratulations on your new family member...sounds like things are a little hectic for now, hopefully it won't take long for them to get use to each other and things will smooth out.
I'll be facing the same situation in two weeks when I bring home my two little girls. Jussi is almost 1-yr old and the girls will be 14 weeks old so maybe (fingers crossed) things will be ok.
Hang in there and keep that smile on your face as you look at their cute little faces. Keep us posted and send pictures soon!