I had a growth scan done in my last pregnancy around 30 weeks because I was consistently measuring 4 weeks ahead and was diagnosed with polyhydramnios (fluid levels were 29) so I had to go for bi-weekly scans. Thankfully my levels topped at 30 but never decreased either. I wasn't put on bed rest, just told to take it easy. Well with three other kids to look after, taking it easy wasn't really and option for me and I ended up going into premature labor at 35 weeks. Between the fluid and the baby, my cervix just gave out from the weight. Thankfully though baby was fine and they told me that it just sometimes happens. I'm pregnant again and just had my 30 week scan. My levels were only 20 this time so no polyhydramnios. Keep in mind that just because you had it in one pregnancy doesn't necessarily mean you'll have it again, should you decide to have another. Good luck, hun!