hey, on december 23 my boyfriend and i didn't have sex, but we both had our pants off so there is a slight possibility of precum going somewhere around the outside of the vagina. i was supposed to have my period around the 26. now it is 11 days late, and i have taken three negative home pregnancy tests. i also have slightly tender/swollen breats. could i be pregnant from precum, or am i just worrying for nothing?