I had my period 16 days ago. I have been off the pill for nearly 1 year and been trying to conceive only since my last period. I am feeling nauseous today and have had tender breasts for a few days. I did a pregnancy test today and it was negative. Could it be too early to detect bHCG? Is it possible that i still may be pregnant? I know i will soon know, if my period does not come.