Weird Cycle

Hey ladies ! for the past 8 days I have been on what I thought was my period first my period arrived 3 days late then the first 5 days was light to the point I didnt need a pad or tampon but for the past 2 days I have been bleeding heavy with blood clots every wipe there is a blood clot im having normal cramping some is more severe then other just unsure and think its kinda weird but my main questions is when should I start to worry ? im not on birth control and im 7 months pp but have been getting normal periods since 2 months pp