had sex just 3 weeks ago, we used protection, but something just didn't feel right about a week after that. I was nauseas a lot, and light headed all the time, and tired. recently, like 5 mornings ago, i had sex again, but this time, no protection he didn't go inside me, but you can never be sure because of precum. anyways.... I got my period a few days ago.... but it's very irregular. i usually only get my period like 4 times a year, so i'm still not 100% sure, could i still possibly wind up pregnant from the 5 days ago, even though i have my period now???