Really good news, i'm so pleased for you.
I have had a stitch put in that somebody else mentioned on this thread. I have a reall history of recurrent miscarriage and the stitch was put in at 15 weeks cos my cervix started to open.
The only thing is though, they dont normally put a stitch in until you are about 15 weeks. They like to make sure you get at least passed 12 weeks first. This is always something you can ask about if you have any similar problems later.