Hi yes.i had sex on the last day of my period 31 days ago that period lasted 2 days the 3rd day was very light since then I have been hungry and eating a lot,feeling nauseated especially at night,I have had a little vomit 2twice in my mouth since,tired,mild lower cramps,my breast feel full possibly swollen but have not changed cup size always bloated since my last period.my periods are irregular and I am 4 days late according to my period calendar.i took a pregnancy test 2nd day of my missed period in the morning and came back negative.could I be pregnant