Thinking on Twins

In our situation, we chose last time, and plan this time, to replace 2 embryos which gives us about a 30-35% chance of twins.  Last time, with a 4-year-old, I felt totally prepared for this, but was happy to get just one.  This time, I still hope for it, in that it would be one IVF for 2 more children, and I don't know if I'll have the chance to do another IVF if we just get one.  However, this time twins seems a little more overwhelming.  DS would only be 2.5-years-old when they were born, plus I have a 6-year-old DD too.  Our house is small, Scott works a lot, we have a 5 seat car, and more.  I guess I'm about half-and-half, hoping for twins, and not.  I suppose that's an okay place to be, but it's definitely something to think about.