The best replacement for weeks is months pregnant.

The best alternatives to weeks are rated as following:
★★★★★  months pregnant
★★★★★  months
★★★★  week's
★★★  points
★★★  months in pregnancy
★★★  southern bell
★★  9 months
★★  weeks'
★★  months baby age
★★  baker and mckenzie
★★  3 months
★  6 months
★  points better
★  baker & mckenzie
★  months of pregnancy
★  even months
★  4 months
★  months pregnancy
★  5 months
★  trimesters
  2 months
  baker mckenzie
  weeks

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Speaking about weeks, one probably shouldn't forget about highest risk of miscarriage.

Other search terms related to weeks and their ratings are:
★★★★★ highest risk of miscarriage
★★★★ months pregnancy
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weeks
months pregnant
months