Thank you for the additional information.
Well there are a few conditions which can cause this sort of spotting apart from being pregnant. the first thing which comes to mind is an infection mainly pelvic inflammatory disease, it may manifest as only spotting however it can also cause burning urination, increased frequency, lower abdominal pain, back pain etc. this can be a slow and chronic infection in some cases and would be diagnosed with the help of a pelvic examination as well as a pelvic ultrasound. The treatment would be with antibiotics.
Another cause of this can be related to polyps inside the cervix or the uterus itself. These polyps can manifest as abnormal vaginal bleeding of this sort and would have to be diagnosed again with a pelvic examination as well as again a pelvic ultrasound.
Now excessive exercise can cause absence of menstruation but at the same time it can sometimes also present as increased bleeding or abnormal vaginal bleeding of the sort which you have mentioned. Now apart from the problems with the female reproductive tract , it is possible that systemic illnesses can also cause this sort of bleeding. A common cause can be hyperthyroidism in which you could also have palpitations, tremors, hair loss, heat intplerance etc. this would be diagnosed with a simple thyroid function test.
So in order to get to the bottom of this, it would be necessary to first see your OB/GYN and have him do a pelvic examination followed by an ultrasound as well as urine tests and cultures. If these come back negative then systemic illnesses would have to be considered as being the cause.
Do you have any more questions?
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