Need Advise and/or input....

Leah
My cycles are normally right on the money. 26 days.  My period is currently almost a week late (was due this past Tuesday)....starting this past Thursday, I have had some mild cramping and brown spotting only visible when I wipe.  I do feel lightheaded and mildly tired but normal PMS sore boobs.  I did get a negative HPT last Wednesday.
I am very hopeful that I'm pregnant but trying to not get my hopes up.
Has anyone else experienced something similar and was indeed pregnant?