Im aged 34 & Usually my periods start on the 10th of every month but if I miss the 10th ,they will start on the 22nd ,now this time I started to have some brown discharge around the 10th & as days passby I started see blood but very little.But then around the 22nd ,the amount of blood increased and until now ,its the 1st of the following month but im still having period blood.what could be causing that?