Reddish string during periods while on birth control pills - Online Doctor Chats

Doctor :   Hi
Doctor :  
How can I help you?
User :   im on birthcontrol and i had brownish blood 2 days before my period and a red stiff string come out then regular blood like my period.but what was the string type thing
Doctor :   Ok
Doctor :  
Before answering that may I ask you a few more relevant questions?
User :   i just want to know if it could be a chemical miscarriage or if its just shredded lining
Doctor :  
Please give your age
User :   18
Doctor :   And also may I know which birth control method you are using?
User :   the pill
User :   i cant pay please just answer im so worried
Doctor :  
Ok
Doctor :  
It is usually due to clots
Doctor :  
this happens with heavy bleeds
User :   but it was light,a light period
Doctor :  
but you also need to rule of any infection
Doctor :  
or lesion
User :   but what was the redish stiff string?
User :   was it a chemical miscarriage?
Doctor :   It is clot most commonly
Doctor :  
Not miscarriage
User :   will i be okay?is it normal?
Doctor :   You need not be worried about it

Doctor :  
but you will need to get yourself examined once