23 week anxieties!

FTM here and I've been in the ER 3 times during my second trimester because I've been getting sick so easily. The last time her heart beat was just a few beats faster than normal and they said it's because of the physical stress my body has been under along with some emotional stress I've been dealing with as well. Although everything else about her checked out perfectly fine and healthy I continue to worry that she'll be born prematurely. I know it's not a hereditary thing but both me and her father were born premature (I was 8 weeks early and he was 10 weeks early) so naturally I just panic that she will be too! Does anyone else lose sleep over this? I always stay up thinking about it and just praying she stays in full term.