Should I take a pregnancy test now?

My average cycle length is 21 days I’m currently 8 days late for my period and I’m 21 days past my last ovulation should I take a pregnancy test now or wait another week ? My average period length is 5 days

I’m experiencing tender breast, lower back pain and nausea but no vomiting I don’t “feel” pregnant not sure what that “feeling” would be I’ve never been pregnant before