should my friend be concerned?

dennise

This is what she told me but i have no clue  hope yall can help me by understanding whats going on so i can explain it to her:

my husband and i had sex recently 

i am irregular  so i dont know when my period comes but two weeks later after sexual intercourse  im feeling only nausea   And fatigue ( a little) i read that your boobs get tender and all the other symptoms but i only feel nausea .. should i be  concerned ?