"drops ins"

ok so here is my first big rant.  yesterday we are enjoying a lazy morning while hubby does some side work.  when he comes home he says his mom is going to stop later but will call first.  now first i should clarify that my mother in law is very new to me.  hubby and i have been together almost nine years and i've only met her once very recently due to their lack of a relationship for over 15 years.  so she is still considered "company" to me.  fifteen minutes after he tells me she'll be by later she shows up!  not only her and her adopted daughter but the woman she is living with (a believe her girlfriend?) and this woman's granddaughter as well.  this is a HUGE pet peeve of mine. i  do not like unexpected company at all.  so my house wasn't up to par by my standards, the baby was in his pjs and down for his much needed first nap in the living room, and i still required a shower.  so i jumped into the shower and let hubby handle a 10 second pick up of the front room while they came up the walk lol.  my problem is this gets me so ticked that i then have a hard time calming myself down to come play the gracious hostess.  am i so wrong to ask for a heads up when company is coming?  not a single member of my family has ever just dropped in unannounced in the entire 8 years we've lived together but his family seems to make a habbit of it.  what are your pet peeves?  are there certain things your spouse's or boyfriend's family does that just drives you crazy?  what have you done to work past it?  i could use some advice on this one so that when the unexpected happens i'm not so stressed about it.