my husband and i have a girl and we are trying to have another, we had sex on the O day and now i have no period, BUT i have NEGATIVE tests and i've taken 3, three baby tests from the dollar store and one first response. im really sad becuase i just need a sign. they came back negative right away is well i have swollen breasts, but always do when get my period, im run down and extremly tired, but i have also had a big week. im nauseous is well but cannot explain that becuse it had been for like a week. their has been some change in mucus though, but not weird changes like green or anything. someone help me :-(