25 week Mono/Di complication

Today at my mfm routine checkup, I was told that one baby is measuring 2 weeks behind. She is only in the 14th percentile for growth & he said that if it gets much lower I will he admitted into the hospital for steroid shots & close monitoring until the babies are born. Has anyone else experienced anything like this? I’m only 25 weeks & I am scared of the worst happening. I’m just looking for similar stories to try to see what I should expect.