Should I test?

Today makes 6 days late. I've been feeling like crap all day. I took a test yesterday and I think I may have seen a super faint line, looked like a shadow sort of. Been having weird twinges in my lower right side. Tomorrow would also be the due date to my first pregnancy. Wondering if my angel baby is sending me a rainbow baby! I just don't want to be disappointed if it's negative again.