Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
First of all the brown discharge you had after the intake of plan B pill should be
breakthrough bleeding. This bleeding occurs due to intake of plan B pill & is normal feature of intake of this pill. Breakthrough bleeding means that the pill intake was successful in preventing pregnancy. So you should not be worried about getting pregnant.
Now as per bloating, this is a very common side effect of plan B pill. You could take an antacid or tablet like ranitidine 150 & will go on its own with time.
A plan B pill should not be used as regular method of
contraception. Regular intake of this pill could cause irregular & delayed periods,
ovarian hyperstimulation syndrome, ectopic pregnancy & other harmful effects including
infertility. Next time use regular
contraceptive pill or condoms for prevention of unwanted pregnancy.
Don't worry you would be fine
Hope this information helps