27 weeks and in the hospital

So I'm sleepless in the hospital tonight. Had a positive fFn on Monday and was told to come in today to check cervical length. It was 1.73 cm and they sent me straight to the hospital for prolonged monitoring. It dropped to 1.5 cm and I was 1 cm dilated. They gave me steroids right away and I will be getting my second dose tomorrow. I have had no contractions and my son has been very active. I should be sent home tomorrow and will be on modified bed rest until I give birth. So much worry and so much on my mind. Trying to stay positive.