Pregnancy Concerns: Possible Conception Timeline & Symptoms

Question
Hi I am 30 I have 0 children my first day of my last period was 21 st of November 2005. It is now January 7th 2006. I had intercourse on from the 26th of November to the 6 of December no later or earlier. During that time 3rd or 4th of December after rough intercourse I did bleed a little. Then on the 6th of December which then the man who I was with ejaculated inside me. I thought for sure I was pregnant after my December period didn't arrive on the 22nd.  So I felt sick and had to make an Appointment in Toronto when I live in Ottawa because they were month ahead booked in Ottawa. So I spent 300 dollars to get to this clinic in TO and very sick but no vomiting so far. This clinic they told me after an ultra sound (normal belly ultrasound and then they did this probe into my vagina ultrasound) and a 12noon urine sample. That it was negative. So I had to get back on a bus very upset and now I am back home it is the 7th of Jan 2006. This all happened yesterday the 6th Jan 2006. I suddenly don't feel as nauseas anymore but I am on 75mg of Gravol since the 24th of December until today 7th of Jan /06 at 8: am. I was thinking because my previous Pregnancies I was extremely sick maybe I physiologicly felt nauseous? I still kind of feel nauseous. Because after the test the gave me I didn't feel as nauseous either but It's hard to say with me being on the Gravol. Anyway today I am very upset and confused, I thought about it over and over and counted even if I got pregnant on the 6th of December because I couldn't have after the 6th because I never had sexual contact with anyone after the 6th of Dec. it would have been 31 days since the 6th of December 2005 last time I had sexual contact with anyone. With the urine test and ultra sound yestarday on the jan 6th/06. Wouldn't it show on the urine test or ultra sound?  PS. this clinic does early abortions on woman 4 weeks plus. It has also been 45 days I counted since my last period. And 32 days since I had any sexual intimacy. The urine pregnacy test at the TO clinic wouldn't it show a positive result after 31 days since the last time I has any sexual connact? or in both diffrent ultrasounds? Belly and vaginal?

Sorry if this sound confusing I am so upset and confused.

Can you help please?
Thank you.  

Answer
If you have a regular cycle and your last period started on November 21, you would have ovulated on December 4 and could ONLY have conceived if you had sex on December 3,4,5, or 6. If you did become pregnant on one of those days, a pregnancy test would have shown a positive result 14-21 days later (between December 18-25). The best time to take a pregnancy test would have been after December 25. A sonogram does not show a fetus or a fetal heartbeat until after 6 weeks (from your last period). However, if the pregnancy test was negative, you are not pregnant. If you have not had your period yet, your doctor can induce your cycle. If both the urine test and ultrasound  showed a gative result on January 6, you are definitely not pregnant.