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Please mention ur last menses date. If this happned just befor or soon after ur periods, there is no possiblility of pregnancy
If this happened around the middle of the cycle (counting from 1st day of periods) , then pregnancy is possible.
There are very low chances of becoming pregnant.
If in doubt you may take emergency contraceptive pill
, which is usualy double the dose of ur regular pill.
Before taking any pills, please discuss it with your dr as well.