So I had unprotected sex 13 days ago during my fertile window, and for a week now i’ve been having the sorest nipples and breasts. I’ve thrown up once a few days ago, and been having killer back pain and waves of nausea. My period is due in 6 days (Wednesday May8) I took a test (First Response)today it came back negative. Period symptoms or pregnancy? Should I retest next week if i miss my period or am I not pregnant?

Just want some outside input!!