I do believe that there's been lots of reasearch about that very topic lately, but unfortunately my brain has gaps in it the size of those in Swiss cheese at the moment. No not black holes......just ones in my short term memory, so I can't remember where I saw it written up.

From what I remember the majority of mums-to-be have lessened symptoms through out their pregnancy.

I'm so sorry. I probably shoulbn't have posted seeing I don't have the answers, but maybe it will prompt one of our more learned people to reply.

Good luck with your pregnancy. I can't wait to meet your little one!