AF and fertile week after MC

im just getting over a MC at 6 weeks on the 28th dec, and i'm trying to work out when my fertile week could potentially be, im not sure if i've read this right or researched it right but am i right in thinking the first day of my mc bleed is counted as my period? or did i get that from somewhere made up? sorry if this is a silly question i just feel at such a loss 😥