During firsr two weeks after having sex I feel signs of nausea and sore breasts but then I got my periods just for one day... after that there were no signs of pregnancy and also prega news home pregnancy test was negative at 5 weeks of after having sex and 2 weeks after my short periods... I want to know am I pregnant ?

If you want to know, consult your OB/Gyn. There is no way for us to tell you.

I can tell you the symptoms you felt were not due to pregnancy since it would be too soon for physical symptoms to manifest themselves.