i agree with tara8888 i think your pegnant if you have no patientce get blood work done monday and in a couple of days you'll know! :) good luck keep posted
You are probably pregnant. From all the info you posted it looks like you ovulated on the 16th- which was perfect to have sex the 15th. Many, many, many women test too early. I have heard about women that test negative, then get a positive after 8 weeks past their next due period. It is hard waiting, but hang in there. It takes a while for the hcg levels to go up. Hope you post a positive soon!