Girls hi! Today on my period I saw something pink. I thought my period…

Girls hi! Today on my period I saw something pink. I thought my period was coming again when I wiped on the paper too it was pink. I went to the store and bought tampons, I passed the day without any problems. We were walking in the park and I held my son for a long time that my hands hurt. Now I don't understand what could it be? Or from the weight or how?