Sir. After Passing My Period Days I Take 4 St

Sir. After passing my period days i take 4 st Mom tablets and after 5,6 hours i felt bleeding and it happend butt not a normal its just for few minutes and after that nothing to happend no bleeding yet after one day i don't know what happend i am also so much worried .please help me what can i do for it?? And why it happend??