When did I conceive?

I am currently 6 months pregnant. My first ultrasound my doctor went off of my LMP and said I was around 13 weeks pregnant but after she did the ultra

I am currently 6 months pregnant. My first ultrasound my doctor went off of my LMP and said I was around 13 weeks pregnant but after she did the ultrasound she determined I was 11 weeks 4 days pregnant. It said that on the ultrasound as well. This was on March 10th. My second ultrasound was May 11th and my GA said 20 weeks 3 days in the top left corner but in the lower right corner of one picture it said GA 20w5d>52.2% and I am confused as to why there was a different GA and a percent? Can someone explain that to me. When I count back I come up with a conception date of December 20th. Can someone help me please. I really would like to know the day I conceived.

or:I am currently 6 months pregnant. My first ultrasound my doctor went off of my LMP and said I was around 13 weeks pregnant but after she did the ultrasound she determined I was 11 weeks 4 days pregnant. It said that on the ultrasound as well. This was on March 10th. My second ultrasound was May 11th and my GA said 20 weeks 3 days in the top left corner but in the lower right corner of one picture it said GA 20w5d>52.2% and I am confused as to why there was a different GA and a percent? Can someone explain that to me. When I count back I come up with a conception date of December 20th. Can someone help me please. I really would like to know the day I conceived.

or:Using a negel calculator i find that december 20th was the first day of you last menstruation. This means you most likely concieved the baby around New years eve, 30th or 31st december.

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