Amino help

I’m wondering if anyone can help . I’m 24.2 week . Iv had scans every few wk from start as I had early losses . Everything is fine but small baby . I had scan Tuesday where I was 23.6 but the specialist said sending me to lpool ladies for this amino . I burst into tears as I suffer severe anxiety. Why would this be needed if just small? My 12 wk screening was low risk plus before this pregnancy me and my partner had all fertility checks done including chromosome one at £450! I’m beyond worried