as you mentioned if the scan was done at 29wks 5days the mentioned pi 1.3 is not above 95th percentile it's normal hence kindly let me know at what weeks the scan was done.
As you are hypertensive and with twin pregnancy you need to take a regular follow up for your BP and for living fetus in twin pregnancy with ultrasound .
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maternal fetal medicine specialist consultation for management of pregnancy with hypertension and twin gestation