Kelly,
When I was pregnant with our twins, my ob used to aim for 2 weeks at a time.. He said anything with a 3 in front was a great start, as in 30 weeks +. Then he would say lets get to 32 weeks, then 34 weeks and would give me the benefits for the babies of making it to the end of the next 2 week goal.
I remember feeling the strain of the pregnancy from 31 weeks onwards and would often run a bath at 4am to sleep in it!
Our twins were born the day before we were booked in to be induced at 37 + 1- 38 weeks was considered full term for twins by our ob.
Twins were both healthy weights - boy : 7 pd 6 , girl : 6 pd 12 -and had no time in NICU. Our ultrasound scan the week before the twins arrived was pretty accurate in weight prediction.
You are doing an amazing job to be chasing around after your little one as well as trying to look after yourself.
Best wishes to you and Mrs S for the rest of your pregnancy.