My husband and I are trying to concieve. My last period was on the 10th of March 2010. We had sexual intercourse on the 28th, 29th,31st march and 3rd of April 2010. My period should have been due around the 13th of April. I have not had my period. I have an cramping on and off for the past two weeks but no period. I do feel a bit nauseous from time to time. Except for that no other symptoms. Is there a possibility that I may be pregnant and if so when should I take a HPT?