I have heard that it is possible to get
your period (light tho) while you are
pregnant...But I don't know about getting
it a couple times. Light periods can
also be triggered by stress (which you are
probably under right now with all this),
as well as a drop in bodyweight (body
needs a certain bodyfat in order for
reproduction), or if you are extremely
active or are on the pill. If you want a
100% answer, have your doctor do a blood
test...With pregnany tests, there can be
false negatives, but there is no such
thing as a false positive. So far, you
have not had a positive reading, which is
a good sign. Go to your doctor - it will
be the only way to tell, and to put your
mind at ease.
Good luck