Since your M/c was NOT that long agao..I suspsect you are experiencing some intermittent spotting. This CAN happen for several months after a M/C. I am also in the midst of a M/C..... And I am so sorry you are facing that! But it's good that you are keeping the faith and forging ahead!
That Thursday/Friday "light" bleeding..... could just be the residual effects of M/C...or the PRE-AF shedding. Either way..the numbers from your BW are what really count. For each IVF cycle I did....I took BCP....then started my Follistim/Menopur injections the 3rd or 4th days after AF began. Being that I was on BCP, sometimes AF was a dribble of blood....and in one cycle I'm not sure I got it at ALL.....but we worked based off of our numbers.
Good Luck!!! Keep us posted on your journey!