Implantation or early period?

Ashley • Wife 6/8/13 Stepmom, Frankie 12/5/18
Hi ladies I need some advice...AF started on the 7th and ended the 14th...so this would be fertile week...had intercourse on the 20th...according to tracker Ovulation date was the 19th....had little blood when I wiped today...would it be too early for implantation or and I getting AF way early...I'm also dieting and lost 10 lbs in a week which I know is a lot...could that be a contributing factor as well...thank you