27 weeks pregnant please read!

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Hi ladies, I’m concerned for my last 2 appointments the doctor said, my baby girl has been measuring a little smaller, maybe bc she’s a girl. He measures her with a measuring tape not a ultrasound. My ultrasound at 19 weeks 3 days the tech said, she was measuring a week ahead. I have high blood pressure and I’m on medication . It’s been not too bad. I have always had high blood pressure nothing new . He said, don’t worry let me do the worrying , but I just want to do a ultrasound to make sure how she’s growing . Has anyone had something similar and everything has been fine ? Thank you for reading. My ultrasound is not till Monday!