Don't know what's happening

For 2 weeks I've been having lower abdomen cramping, sore to the touch boob, nausea and have been tired. Well yesterday I thought I started what was suppose to be my period. So I put a tampon in and due to my mini activities yesterday I accidentally left it in all day. When I changed for bed there was barely any blood on it and This morning the blood looked brown and only the tip of the tampon had anything on it. Can anyone tell me what's going on? I've always had a regular period that last 3 days and this is a first for me. I was praying Mother Nature wouldn't come visit me this month😩