Positive??

Sarah
Since miscarrying in Feb, in between my periods have been 28-32 days. On Monday I began what I thought was my period but very dark and not much blood. I also took a negative test. I've had a period for 2 days and now gone and although it was a definite light period very different to normal it was a lot more than discharge.
Today I've taken another test as I'm due for a hospital procedure on Saturday and I've had a definite positive? Do you think that was heavy implantation? I'm hoping as I bleed before the positive test that I should be ok but it's a bit weird! X