my advice would to buy another test if you don't start soon. sometimes you can get a false negative when you take an otc test. even if it's still negative you should go see your ob to be on the safe side. when i was pregnant with my daughter i took 4 test and they all came back negative. i went to see my ob and found out i was 9 weeks pregnant. my ob told me that some of the meds i was on were what was causing the test to come back negative. so it's worth a trip to the ob to be on the safe side if you don't start soon.
im worried i might be pregnant i was only spotting yesterday and then it stopped i took a test and it was negative