Hi and welcome to ehealth!!!
I am not sure if your cycle days would have anything to do with the m/c. Are you tracking your fertility at all with temping, ovulation predictor kits, or by cervical fluid? I would have to think that if you know when you are ovulating that it wouldn't make a difference with the number of days in your cycle and that they have increased.
I used to be on a 21 day cycle for about 1 1/2 years. Before that I never really paid much attention to them. Then out of nowhere they started to get longer like 27-28 day cycles. Then for the past year or so they have gone from 24-27 days. One month it would be on the short side then the next month it would be on the long side. Now and for the past 3 cycles they have been 26 days. And I have no idea what would be causeing such change in the number of days. I have a good sense when I am ovulating, so i just pay attention to that.
Hope you get that bfp soon!!!