Oh, sweetie, I feel for you, I really do. our first baby was stillborn following an early miscarriage of another and I can only comment from a male perspective.
You must not worry - for any rejection of a foetus is due to a pathelogical condition that will profoundly handicap the child and your family. I am sorry if this sounds dramatic, it is not meant so to be. Enjoy your pregnancy. After all, you are in tip top health to become pregnant in the first place.
Now is the time to have a regime and a goal. There is a finite point - nine months! Now is the time that you can succour girlfriend relationships for it will be they who will be of greatest help in the days, weeks and years with your new born baby but you must not forget your husband, partner, boyfriend that you still have time for them to pamper you to pamper them... if you get what I mean.
Make some modest changes to your diet and lifestyle so that you eliminate caffeines, quit smoking, reduce alcohol, do not go out partying until the early hours of the weekend; instead, go for a walk in the park, skim stones in the local river or duckpond, visit the library in your lunch-hour and read peotry or view an art gallery.
Basically, take things easy and relax - don't allow your work to stress you out, delegate if you can or confide in your line manager that you need support. No-one is an island however much anyone tries so to be. Good luck
EJ