Early in the game to be pushy...no?

[Mamma_Mia]

I had an interview on Tuesday and it went very well! Happy baby who will be 12mos at start of care. I'm not sure if these are RED flags or pink-ishy one that I can 'help' avoid...

A) they emailed me asking for a interview 3 times in one day + 1 phone call
B) could only be available for a 3:30 meeting (dcg was being pu'd early) so I agreed - while here mom mentioned "oh I was hoping to see all the kids in action". To which I said if dck's were here I would not agree to the interview, I'm sure you wouldn't want strangers coming by your daughter during the day...*smile*
C) emailed me today saying that they would love their child to be with me but....have a concern re: the # of kids I have in care, not that I have an issue now but would like it for me to keep it that way (so not taking in any others). They would like me to follow the Licensed rules...no more than 5 including my own, 3 under 3yrs and 2 under 2yrs etc.

Right now I have:
dcg 3yrs - 3 days a week (mom is prego, due in Nov. and don't know what's going on with that yet )
dcb 2.75yrs - comes 1 day a week (dad's company is slow)
my own DD 2yrs
in two weeks - dcg 8mos old FT
then there would be their child at 12mos FT

Am I sensing warning signs
or
have I read too many horror stories and now have my guard WAY up...it is something to even worry about?

How can I say "I can't see the future but for right NOW that is all I am taking in (I wont do more, two 'babies' are enough!) and when/if we come to that bridge we can discuss then"