Am I pregnant?

I had unprotected sex the 7th of this month. I had my period the 20th. It was one day of light pink bleeding and one day of blood and one day of brownish red. My periods are always 5 days or more. I usually love steak but a little over a week ago my mom made Mongolian beef and I took a bite and a surge of ew went through me. Tonight we had steak and I took one bite and nearly threw up. My nipples have had these blue veins and they seem to not be going away and my nipple are puffier than normal.