Please Help Explain My Due Date!

Sara

This will be my second pregnancy (miscarried in April 2018).

Are weeks always calculated from the first day of last period or from ovulation? When I was pregnant back in March I thought I was 8 weeks but only measured 6 in an ultrasound so I get very confused on this!

First day of my last period was August 23, 2018. Glow predicted my ovulation for September 14 but I felt like I ovulated on September 18th. I took tests yesterday and today to confirm pregnancy. I should have started my period today September 28.

Also, when do I go in for my first appointment? I wonder if I had an ultrasound too early with the last pregnancy...

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