Thanks for writing in,
The spotting is more of an indicative of pregnancy
when it is on the expected periods of menstruation
In your case absent period and pelvic pain
with spotting are indicative of something serious, may be you are pregnant and the miscarriage
is also on the way.
Please get a home urine pregnancy test kit and report to the local Gynecologist for further action.
I hope the advise would be helpful for you.