short cervix

So today at my follow up anatomy scan the tech ending up having to do a vaginal ultrasound to see my cervix. The doctor confirmed that I had a short cervix and since yesterday I was getting cramps to go to the hospital. She said I was at high risk for preterm birth 
I've been at the hospital now for a couple hours and the nurses can't seem to say how long I'll be here or exactly what is going to happen as they say every case is different and they can't tell me for sure
Any of you ladies experience this 
I am getting very scared as I don't want my baby to come early I'm only 22weeks 2 days 

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