I had my period on the 8th of this month until the 11th. And ever since then my lower stomach has been rock hard. I have been dizzy having constant headachs for the last week and just recently started feeling nautious at the smell of certain things. I took a pregnancy test last night, it was negative. Could it have been to early for an accurate test? Could I be pregnant?

Most likely it was too early to test. You will have to wait to see if you miss your period to test next month. Let me also remind you that testing in the evening has a tendency to give false negative results, therefore it is important to test using first morning urine instead.

How long should I wait to test again?

Wait to see if you get your period next month. If not, test using first morning urine at that time.