Cramping and nausea

Lacey β€’ Married πŸ’ to an amazing manπŸ§”πŸ», mama to a handsome little boy πŸ‘¦πŸ» born 6/9/17 and a beautiful baby girl πŸ‘§πŸ» born 3/15/19 Pregnant with baby #3 due December ❀️
So Glo shows on my calendar that my best chance at conceiving was Friday, I had unprotected sex with my SO Saturday night and Sunday, for the past two days I've been nauseas and had lower abdominal cramping, AF is due in 9 days. What are the chances that this is implantation cramping? Maybe just early period cramping? Any thoughts ladies?