What is this?

Maya

I’m 1 year postpartum and recently had intercourse my ovulation date I’ve been spotting since after ovulation and my cycle is in 9 days this has never happened is it a cause for concern ? I’m also 6dpo so it should be too soon for implantation pop (also started off red specks very light and then it went to dark brown and back pink ) it’s on and off seems like