My period postponed more than ten days, but now see red, how to return a responsibility

Menstruation delay ten days now see red may be due to irregular menstruation caused by menstrual delay, and now menstrual cramps; may also be because pregnant, and now there are threatened abortion; recommended to the hospital to do HCG, progesterone and other related tests, if due to threatened abortion caused, you need to protect the fetus treatment.