Help!

Ok so my period started the 11th and I had horrible cramps that entire day that had me in tears and they started decreasing when I went to bed and ended halfway through the next day then no more cramps after that. And it was pretty normal and ended after six days and the day after I had brown old blood discharge sorry for tmi. And then the next day (today) I start bleeding again, like this morning I wiped and it was brown and bright red and I'm freaking out. I never haf this happen before and idk why I'm bleeding again. Have any of you ladies had this happen? Should I see a doctor? Is this normal or not? Is it a sign of endometriosis? Any replies would be greatly appreciated thank you!!