Hey Leah,
I hate to say it but the 12 week mark doesn't guarantee that m/s is going anywhere any time soon. Everyone is different.
I had m/s from about 7 weeks through to 17 weeks. It started off as me feeling queasy allllll day. Once I hit 12-13 weeks, it changed to where I would be sick every single morning - no matter what. I got very good at having a big glass of fruit juice as soon as I got up and within 30 minutes to an hour, I would be throwing it back up again. Then I was able to eat breakfast and go about my day. I still had boughts of it throughout some days (and had quite a few sick days at home because of it) but it was a little easier to manage than feeling gross all day long!
My 17 weeks it started to subside to where I still had nausea in the mornings but I found it was because I was hungry. Eventually it went away (by the 3rd Trimester) where you have a whole bunch of other things to worry about (indigestion, tiredness etc. etc.).
It's all so wonderful, isn't it?? LOL