i had protected sex on dec 25, and got my period on dec 30. i had unprotected sex that night, while on my period, but he didn't cum inside me. i'm worried about the precum though, i heard sperm can live in it. i wasn't worried about being pregnant. my period ended on jan 6 and two days later i started bleeding again. ive been nauseous for the past few days, but something is going around my family. is there any chance that i could be pregnant? and when would i have gotten pregnant?