Is it possible to feel pregnancy symptoms 6 days before your period

My husband and I had unprotected sex and ejaculated in me on what glow says what my ovulation day is.

Yesterday I got menstrual-like cramps then it turned into nausea for 2 days now, accompanied by fatigue

Just wondering why I have this constant dull nausea and if it’s possible it could be pregnancy, or if I’m just sick

Period isn’t due until this next Monday