Hi, 
Thanks for posting in HCM. 
I understand your concern. 
Based on your description, you need to understand that there would be irregular bleeding happening if you are taking pills irregularly. 
Hence, it is difficult to predict why you would be having 
bleeding after intercourse and how long that would last. 
Also, there could be a possibility of certain lesions causing bleeding such as 
cervix inflammation, uterine polyps or mechanical 
injury to the vaginal mucosa. 
Hence, you need to be evaluated clinically by per speculum examination and you need to undergo 
ultrasound scan of the abdomen to know what could be the cause, so that it can be managed accordingly. 
Kindly consult Gynecologist in this regard for appropriate evaluation and management. 
Hope the information provided would be helpful. 
All the best.