Pregnancy Timeline & Conception Date: Calculating Your Due Date

Question
My LMP was between the 24th and 26th of October 2005 lasting 7 days. I had intercourse on the Nov. 6th-9th. Took a hospital pregnancy test(urine) on Nov. 15th which was negative. Had intercourse again on the Nov. 16th (I was very intoxicated). Took another on Dec 2nd, 2005 and it came back positive as 4 weeks pregnant and the doctor didn't see anything, but I was urinating blood. On Dec 12, 2005 my sonogram showed that I was 6 wk, 6days. Jan 19, 2005 sonogram showed 12 wk 6 days.
When did I conceive?
Could the blood in the urine and clots been part of the baby or a UTI?
What is the earliest that you can see a sac or anything?
Can you help?

Thank You

Answer
Nicole,
Based on your LMP and your ultrasound, you conceived somewhere around November 8th.  You can usually see a yoke sac around 4-5 weeks by transvaginal ultrasound.  As far as the blood is concerned, It shouldn't have come from the baby.  It sounds to me like you had a UTI.  I hope this helped.