Hi Nicole -
I agree about the fumes. If it is latex, you are fine. You may want to try to get out for a bit, but you can even paint with latex when you are pregnant. Paint has recommendations for the ideal temperatures (it will state it on the can). When we had our outside windows painted, we went with a company that stood behind their work for a year. So I would make sure the painter does that for your outside paint, it does have a tendency to chip and peel due to intense sun, heat, cold and moisture. Also be concerned about it it is too wet out to do your outside painting, not just too cold. I think if the painter will stand behind his work for a year, then he will want to paint when the conditions are right. Have it in writing though. If he won't stand behind it, then I would do your research (about good temperatures etc) and you dictate the date he paints and base it on conditions you think are optimal.
Best of luck.
S.