My periods come on last month on dated 1st jan. In this month my periods come four days late and it is just a stain for five days and after that periods come with full pressure along with clots. Before 20 days I checked whether I am pregnant but it showed negative result. Now doctor suggested me sysron -ncr tablet and when I take first doze it decreases the flow and on second day blood come large than previous days. Am I to worry about this.