I suggest you prepare him that its time to give them up. I tried to gently wean my very addicted dd but eventually I had to tell her that we had given them all to my sisters baby. If you search past threads some people have great ideas about dummy fairies arriving, leaving notes to prepare for the dummy heist and the leaving notes and presents.
To be honest the first week was tough. She missed them so much. I felt awful like I had taken her best friend. Then it was over. No more asking. No more crying to settle. She snuggles with teddy bears etc so still has a comforter but no longer the dummy. You will have to be tough for a week. Cuddle him lots. Hold him. It is hard for them but at two you can reason with them when they are calm. Good luck.
Edit-sorry half asleep just read that u don't think fairies etc would work.
As for morning sickness get some maxalon! I feel for u it's awful.