Baby's nursery

Currently we only have a 2 bedroomed house and we're 9 weeks pregnant with our first baby together, however SO already has a 6yo daughter. Her room is reasonably sized but she has so many toys and it's turned into abit of a dumping ground when she's not here. We're looking at nursery furniture and such already and I just don't know what to do.

Is anyone else getting stressed out about it so early?!