So how far along am I? Please help me understand

Krystal • TTC baby number 2. Aubrey Lynn October 2015 .hairstylist, wife, puppy mom
Ok so last month period was Jan 20th.. by my LMP I am 9w and 4 days.. but i.wasent pregnant with baby the first day of my last period.. I got pregnant about 2 weeks after...so baby is only in my belly 7w and 4 days.. so when I go for my ultrasound.. How will the docs see baby as?? I hear they go by ur lmp but I don't understand why

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