A little worried. Ok a lot worried.

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So my last pregnancy ended up being an emergency csection at 30weeks due to HELLP syndrome. I saw my doctor on Thursday and she said my belly is 2cm under what it should be. (I'm currently 27weeks) She has me going to see a new high risk doctor on Tuesday for an ultrasound to get measurements on the baby and to find out if I'm possibly heading toward preeclampsia again. I'm really scared! I don't want another premie. Anyone measure small and have a healthy pregnancy and baby?