Hello! After childbirth six months have passed. I am not breastfeedin…

Hello! After childbirth six months have passed. I am not breastfeeding, my period started after one month. Everything was fine, but for the last two months I've noticed that my cycle has become shorter (24 days), usually it was always stable at 28 days. The duration of the days increased by four days and became almost seven days. This time on the fourth day they ended, after a day a strong clot with blood came out, then after a couple of hours everything ended. And in the morning again today they come out intermittently with clots of blood. Has anyone had this? What could it be? I can't go to the doctor yet.