Antenatal thromboprophylaxis for those with previous VTE should begin as early in pregnancy as practical.

Women with previous VTE should be offered prepregnancy counselling, and a  prospective management plan for thromboprophylaxis in pregnancy should be made. Those who become pregnant beforemreceiving such counselling should be referred at the earliest opportunity in pregnancy to a clinician
with expertise in thrombosis in pregnancy.

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If the placenta is thought to be low lying (less than 20 mm from the internal os) or praevia
(covering the os) at the routine fetal anomaly scan, a follow-up ultrasound examination
including a TVS is recommended at 32 weeks of gestation to diagnose persistent low-lying
placenta and/or placenta praevia.

Use of TVS- to accurately see the placental edge. Also, cervical length is a predictor of antepartum bleeding and emergency preterm caesarean section in placenta praevia. Women with a cervical length of less than 31 mm have a 16 times higher risk of emergency
caesarean section due to massive haemorrhage.

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• Before anticoagulant therapy is commenced, blood should be taken for a full blood count, coagulation screen, urea and electrolytes, and liver function tests.
• Performing a thrombophilia screen prior to therapy is not recommended.
• D-dimer testing should not be performed in the investigation of acute VTE in pregnancy. ( D Dimer levels are usually high in pregnancy).
• Compression duplex ultrasound should be undertaken where there is clinical suspicion of DVT.If ultrasound is negative and a high level of clinical suspicion exists, anticoagulant treatment should be discontinued but the ultrasound should be repeated on days 3 and 7.If ultrasound is negative and there is a low level of clinical suspicion, anticoagulant treatment can be discontinued.
• Women presenting with symptoms and signs of an acute PE should have an electrocardiogram (ECG) and a chest X-ray (CXR) performed

1. Women presenting with symptoms and signs of an acute PE should have an electrocardiogram (ECG) and a chest X-ray (CXR) performed.
2. The algorithm suggested in the Green Top Guideline can be viewed HERE 

Undertake a urine dipstick test in all women presenting with urinary
incontinence to detect the presence of blood, glucose, protein, leucocytes and nitrites in the urine.

Read about Intrapartum Care in VBAC-

https://obgresource.com/2021/12/10/intrapartum-care-in-vbac-2/