20 weeks

So today is a huge milestone for most but it's a difficult one for me. I am officially at the halfway point but on March 16,2015 I was 20 weeks 1 Day when my water broke on my son. Unfortunately 2 days later I delivered him and his twin sister. I'm excited and very scared at this point. 2 weeks ago I had a cerclage put in to help me hold this baby in and it's been mostly uneventful so far. I have my first follow up and anatomy scan for Friday and it can't come fast enough.  I am believing God for a miracle and that I will sustain this pregnancy long enough to bring home a happy and healthy little boy. But some days anxiety sets in. Anybody have any similar issues? Thanks!!