It's 8 days after intercourse and 3 days past ovulation. I felt nauseous sometimes, breast tenderness but didn't notice…

It's 8 days after intercourse and 3 days past ovulation. I felt nauseous sometimes, breast tenderness but didn't notice any changes yet in my nipples, I always felt tired like my feet are aching when all I did was lie down and slept all day and I'm always hungry! Like I'm craving for foods non-stop! And oh one more thing, I felt slight cramps and backaches. Could I be prego? Or maybe it's just PMS? Lol