Me and my boyfriend had unprotected sex on 8/3 and 8/4, my period came on 8/5. It was a normal period and lasted 4 days as usual. This month, my period came but didn't come until 8/7 and is now over after only lasting 3 days and it was deep red the whole time. I took a home pregnancy test and it showed negative but i've been feeling sick and my breast are getting bigger and are sensitive. Could I be pregnant?