Usually 2 to 3. If you had your second trimester ultrasound, you probably wont have another unless you go past your due date or they think the baby is too big.
With my 1st I only got 2, but that was before, with this one I have one every 4 weeks until 32 weeks then it is every week but I have medical problems I almost lost my first born, my placenta keeps the blood flow forming going through. Also have heart problems but if you want more I would suggest a 3d ultrasound.
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1.9 weeks
2.13 d.s.