Long shot but maybe someone experienced similar.
Was having a seemingly unovulatory cycle, then ovd on cd 21 (I think), got faint bfp on frer and answer which slightly progressed by the next day, on what I think was 12 dpo (last Saturday) then bfn on frer and cheapies 13 dpo, , bfp on sainsb own 14 dpo, bfn on frer the bfp on frer with fmu.
I put it down to a chemical but had some baby plan tests so did one yesterday morning with smu and got a faint line, same just now fmu.
I have been pregnant many times, 6 babies, 1 blighted ovum and a number of chemicals, but with the latter I'd normally start bleeding quite soon after a bfn following a bfp.
I am now 17 dpo, af 3 days late.
there is clearly no viable pregnancy there but surely hcg won't hang around for that long in small amounts (I know it takes a while to drop if mc is later on but this is just confusing.