Is it normal to feel nauseated before your period?

So these past few days I been feeling nauseated. I had intercourse 4 weeks ago and I still have not gotten my period. I feel sharp back pain,bloating, cramps. I been stress about work, school and my visitor. And I feel so emotional. My visitors are girls... But the nauseated feels bad.. Only happens in the evenings (Edited) I have taken a pregnancy test and it is negative. However I have frequen urine now ;-;