AS only one of your tube is blocked, there is good chance that you missed period suggests pregnancy
But, for confirmation of pregnancy, please repeat the urine pregnancy test after about 1 week of missing period, if you dont get normal periods by then.
The test done previously was negative, might be as it was too early.
The discharge might be due to implantation
spotting around the time of expected periods.
Hope this information is helpful.
Dr. Mrs. Sumeet Baheti