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Pregnancy Due Date Calculation: Understanding LMP & Conception


Question
I got my 3 ultrasound done on Nov 4, 2009 and it read 7 weeks 5 days pgnt And I am due on Jun 18, 2009 . I am trying to find out this whole LMP and due date thing My LMP was Sept 12, 2009 how do you calculate the due  date from that?
When did I conceived if I had sex on the  Sept 20, 22, 28 and 29?  
How long does sperm stay inside of the vagina?
How far along would I be Sat?

Answer
Hi Tequella,

You add 40 weeks from your last menstrual period. I can't predict which day you conceived as you were fertile each day on which you had sex. The maximum days sperm can live inside your body is usually five days, and only if you have optimal cervical mucus. Sperm last longer in that fluid, which peaks shortly before ovulation. On Saturday you will be 8 weeks and 1 day pregnant.