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If your Periods had been regular and if you have had unprotected sex between 3rd and 21st July which is unsafe period, you will stand chances of getting pregnant.
But wait till 31st July to test for a Urine Pregnancy
test using a early morning urine sample. Discharge can also happen even if you are not pregnant as a normal cleansing process. Other wise there is nothing to be worried about.
All the Best and Wish you Good Health.