I had a missed miscarriage and an ERPC in January. Luckily my cycle went back to normal very quickly and we have started trying again. My period is not due until tomorrow but I have been obsessively doing tests since Monday, getting a BFN each time. shouldn't I have a positive by now even if AF isn't yet due? Has anyone else had BFNs before their period is due but then got a BFP afterwards? Help- I'm obsessed!