Hey Treelo,
I am sorry af came early
The same thing happened to me last cycle I got mine two days early and started out similar to you then got heavy for two days then two days of spotting and that was it. My af usually goes for at least 4 to 5 days of bleeding then spotting so this was a suprise. I just think after a miscarriage everyones body does different things in order to get its self back to normal so this is probably a one off thing. If you are concerned though see your dr. Are you temping? if so did your temp go down or has it stayed elevated?
I know how frustrating it is just when you think things are getting back on track you body gives you another suprise. I hope it all sorts its self out soon and hopefully next cycle we will both get BFP's!