Pp bleeding or first period

Taylor

How do I tell the difference ? I’m a little over 4 weeks pp. I’ve read it’s possible to get your period this soon. I breastfed for a week and stopped. My bleeding tapered off to white and yellowish discharge. Then me and my SO had sex(I know I should’ve waited but I didn’t) i bled light pink the day of then it stopped a couple days and now its back darkish/bright red. I’m NOT filling a pad every hour so I’m just curious what y’all think or have experienced