Clarification on discharge or spotting.

I got my last period on 28th Jan. I did pregnancy test on 8th of March it was negative. I got food poisioning on 11th of March and I got dark yellow or may be brown colour urinal discharge 2 3 drops and den I again did pregnancy test on 16th March again it's negative and I did it again on 21st March again it's negative. I always had protective sex and my last sex was 2nd March and while cumming also he cummed outside always and from 23rd March I started taking Meprate 3 times a day after lunch and I have fineshed taking my dosage yesterday. I am scared was that discharge was pregnancy spotting however my test was negative all the 3 times and I developed a problem of urine leakage too but now its nomore happening. Kindly guide me if I have a chance of being pregnant.