if is possible tag you did have a very early miscarriage
, which would explain the positive test. however, it is also possible that it was really a negative test. this can sometimes happen when the test is allowed to sit for a long time before it is read. occasionally when that happens it appears like a faint positive. this is the reason why there is a control line as well. a soon as the control is positive, te test line should be positive as well, if it is not, the test is negative and should be discarded.
I not sure how to explain the other symptoms though. however, occasionally a person can have a delayed or an early cycle with the paragaurd, though it should correct itself. you should be asked to get breasted for infection too, though they are rare, it might explain the gray substance you saw. other possibilities include small polyps, old blood, semen, yeast, or other things.
I hope this helps, please let me know if you need more information.