I'm so confused help me!

Graciela
My period is due on the 17th but I've been lightly bleeding all week. Like ridiculously light which is not what I'm used to. But some days I would and the next day I wouldn't. And it's so light it doesn't even go on my panties. And it only last about 10 minutes. I don't know what it is. And I don't feel like my period is gonna start. I've been having symptoms of nausea, back pain, swollen breast and you can see my veins in my boobs. I have tons more! I also went to the doctors and took a pregnancy test there but it's negative. But they couldn't do a blood test. I'm so lost. I take some at home and I get faint positives but I digitals I get negatives. Help me!