Haven't checked it again, went into maternity around 1am as I started having some gushes, midwives did a few tests and said it wasn't amniotic fluid. Had the scan this morning and it shows I am leaking amniotic fluid but cervix is still closed (thank god for that!), there is fluid between the sac and cervix and fluid in the cervix but no visible break in the sac, cervix is 32mm shorter than it was at the last scan I had at 17wks 5d though.
So now I just have to wait until I see my OB on the 2nd of March and try to take it as easy as possible - back to couch rest for me once again.