Emergency stitch

Just came in for a check on my cervix this afternoon and had a dramatic change from 28mm its gone down to 22mm in a matter of 6 days.  I have been admitted into hospital and had an emergency stitch placed.  All went well but still here in hosp and will b in for a few days for observation. So scared as I had a still birth at 22.4 weeks in dec. I'm now 21.4 weeks with this pregnancy and keep thinking  the worse 🙏🙏🙏🙏🙏🙏🙏