Morning sickness STARTING in the 2nd trimester??

Caoilainn • 32, married, polyamorous, geeky artist who loves everything from computers and animals, to sewing and camping.
I'm currently 15wks with my first baby. My first trimester had a lot of symptoms in it, but fortunately nausea/morning sickness was not really one of them. However, about 2wks ago, I started noticing being queasy more often (though fortunately no throwing up), which has started getting more frequent and at different times of day. Has anyone ever had morning sickness START in their 2nd trimester??