Pregnancy problem, help me

Hi,
1I'm having sex on 20th Jan 08 and a week after that I feel nausea until today. This feeling reminds me during my last pregnancy 3 year ago. But I got my period on time at 31st Jan. The took the test on 30th Jan and it came out negative. But I still got this bad nausea and feels like I'm pregnant. Is it possible to be pregnant in this situation. I'm afraid this is only my feelings as I 'm expectimg to get pregnant since one year ago but never succeed but I never had this feeling before. Please advice when should I take another test.

There are many reasons you could be experiencing nausea. If it persists I would suggest seeing a doctor. Since the test came out negative I bet you aren't pregnant, but to make sure I would take another test in a week (or less)...

Thanks agent10ve. I will take another test after a week time as advice. I will update the result in the forum.