What the heck body?!?!?

Idk what the heck is going on with my body and I'm wondering if anybody else experienced this (whether pregnancy or something else was the cause.) So my period was on time, the 17th. However, it was soo light. I couldn't even fill a pad that day. The 18th still was very light but red and brown so I'm assuming my period. The 19th it was brown spotting sooo light that I couldn't even fill a party liner. No clots throughout the time. (Though I don't ever get clots) I'm done bleeding but I'm still pretty crampy. The whole time my cramps weren't bad but there. I'm still feeling those today. Has anyone else had this experience?