Should you call a doctor if you have light spotting before your period which you have never had before and you just passed a massive clot with bad cramps and heavy bleeding?

YES! The answer is definitely yes! If you are or were in pain and you had a massive blood clot pass through and now you have heavier bleeding then yes call your doctor ASAP. Not to scare you but you could of had a miscarrage. It is important to make sure you did or did not have a miscarrage because if you did in fact have a miscarrage then you need to been seen by a doctor to make sure you had a full miscarrage and their is not traces left of the embryo inside you because that could cause you problems and possibly an infection. So yes go to the doctors ASAP.