HELP HELP PLEASE!!

I thought I might have been pregnant cause I had my period but it was weird and not normal. It's been a little bit since then and my tummy has been a little tighter like it does when I am on my period but it goes away usually, and my lower back has been hurting and I have been emotional and pissed off. So I took a test. It was negative. I though I saw a very very very faint positive but my eyes are super bad and I don't have my glasses so I ignored it. Well I was cleaning and at it again and it looked, still very very faint, but I can see it more. But it's only when I move it and try and focus my eyes. Does this mean I could be pregnant or am I dying? Or is it because it's been over a day or so and I am scaring myself?