OP here. First, I'm not in the DC area, but in a smaller town, so there are not "plenty of 2-3 week gigs on care.com" here right now (trust me, I've been checking care.com, sitter city, and even craigslist multiple times each day). I've found one or two that are looking for the entire month of August, but that would put me in the EXACT same position, because my new full time job starts August 24th. (I actually did find a family on sittercity who posted Wednesday night saying they were coming out here for a vacation rental for the first week of August and their au pair decided at the last minute not to come so they needed help 4-6 hours every day that week. I contacted them, they called me for a phone interview, they told me based on the phone call and my sittercity reviews, etc, that I was officially hired and to start Monday. But they texted me just this morning to say their au pair had changed her mind again and was coming so they didn't need me after all.)
I delayed responding to the "unpleasant" family while I emailed my babysitting contacts to see if any of them could use me during those three weeks. Although one family said they can use my help for a half day one day, and another said they can use my help for 5-6 hours each on two days, I still have more than 2.5 weeks of no pay. And, the last family I was waiting to hear back from about that (who, like most of my other babysitting contacts, said they don't need me at all during the week because of preschool or au pair coverage), didn't respond to me until this morning, so I think by now the unpleasant family has probably found someone else for Monday anyway.
I'm hoping I might be able to find postings for "last minute, day of posting" babysitting jobs, but...I'll have to wait and see.
Sigh. I guess it's better that my karma is not ruined, even if I end up ruining my bank account
