i have an appointment for 28 weeks growth scan and an appointment to s...

Not enough information in the question but I wonder if they have detected a low PAPP A hormone level.

I am sure your appointment for the scan at 20 weeks will arrive. Regarding the low hormone level, it can be associated with slow growth of babies and hence the advise for the scan at 28 weeks to assess the baby's growth. You may even be given more scans further in the pregnancy.

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