Hi sashisinchury ,
I have gone through your question ,
a woman's ovulation period is generally from 10th day to 17th day from the beginning of the period , as you said that your period started on 3rd
dec, 9th dec would fall on the 7th day, hence there is no chance for you to get pregnant.
pregnancy test usually shows accurate result generally after 45 days.
hope this helps you
Dr.G.Gayatri devi