Ski Trip During Pregnancy???

Cl
So my mom wants us to take a family ski trip this winter. At this point, I'll be 28 weeks along. I told her I wasn't sure if it would be a good idea to go that late in a pregnancy. She seemed to think skiing on the greens wouldn't be an issue. Anyone have an idea about that? I haven't had my first doctor's appointment (and won't for another five weeks--my work schedule is really busy until then). I can't exactly call the doctor about that because I haven't picked an OBGYN yet.