Pregnancy Dating & Due Date Clarification - 39 Weeks Pregnant

Question
hiya i woundered if you could help me figure out something im 39 weeks pregnant as of today and im due next sunday the 24th september but i get a bit confused as to how everything works when it comes to dating the pregnancy i dont remmember exacly when my last period was but i no it was some time in december 05 im due the 24th sep 06 i had an ultrasound on march 17th that sed i was 12w 5d and another one on the 19th of may that sed i was 21w 5d i woundered if u could tell me when roundabout my lmp was and my likely date of conseption i had sex on the 8th 16th 17th 30th 31st of december and 1st of jan 06 thank u for ur help

Answer
Hi Manda, I did some calculations with the numbers your provided me. Keep in mind, this is just an estimate, and gives you a rough Idea, of likely when conception occured.

From my calculations, your last period, ended roughly on the 10th of December.

Your actual conception Date, was somewhere in between December 27th, and and January1st.

I calculated everything twice, and got the same numbers. And remember, its only a rough estimate to give you some idea of timing.

Hope this is of some help, and thanks for writing.

--Kristy