Hi,
I posted a similar message a few days ago but got no response 
TTC, since January.
I had brown spotting, only when I wiped on and off for a few days leading up to my period. Never happens me. Ever. I bled then, light for a day, then the next day passed a big clot and lots of small ones throughout the day and red blood, then it went light again for 2 days and now I'm spotting pink when I wipe. All of this has never happened me. My periods are regular and always the same, I always know what to expect.
Also I had no cramping at all which never happens and no pms symptoms, except tiredness.
I am still testing bfn though.
Could this have been implantation followed by deucidal bleeding?
Could my hcg levels be too low for urine testing? Am I going crazy? (Probably!)
I've heard both of these things can happen and clots actually occur during deucidal bleeding..
I have made apt for bloods but I have to wait over 4 weeks
Apart from fatigue and craving chocolate more than ever, I don't feel different and I've never been pregnant but just don't understand the weird bleeding 
Anyone experience similar?