Anyone with this experience ?

Ash
My period ended around the 14th-15th. I'm having some back pain and abdominal pain. The pain started on the right side then switched to the left side and now it's just cramps in the lower part of my abdomen. Does anyone know what this could be or have similar cramping experience ? Could it be the earliest stages of pregnancy or something else ? Any tips, thoughts, or stories are welcomed and really appreciated! ☺️