Would the following be a miscarriage or late period?

Period is two weeks late. Take a pregnancy test on a weekend, first urine an is negative. Take another test Monday and the test is negative.

Take a test midweek, shows positive.
Go get a blood test done for pregnancy - and the next day HEAVY bleeding starts , but the tests come back to show negative for pregnancy

Is it possible for this to be a miscarriage given that heavy bleeding occured after a blood test and 2 home pregnancy tests showed negative and one test showed positive? Or is this a later period?