No slap from me either, I'm afraid...as I think you need a cuddle instead.
I'm so sorry, the waiting is especially awful, even when I've known there is realistically no chance a tiny bit of me still hopes and it is very hard until you know for sure.
Honestly, if you had been taking folic acid and not breastfeeding, your brain would probably just have chosen other things to worry about, I think it is a form of self protection. MC a wanted child makes you feel so utterly powerless that I think in a strange way the brains way of coping is to try and think it was somehow caused by some choice made, as it gives it the illusion of having some control, if that makes sense.
Things I have genuinely worried have caused me to miscarry (not the exhaustive list either, just the ones that come to mind right now): inoculations I had for work in the far east, the waist band on my jeans being too tight, the dog pulling on walks, working with the the laptop on my knees, the chemicals used to kill bugs sprayed in some of the places I have lived/worked abroad, being knocked around on the tube when commuting, hot baths, getting too cold, carrying shopping home, not getting enough exercise, working too long hours, staying in bed at the weekend all morning when knackered etc etc.
And I promise you I'm bright and (fairly) well balanced!!
Please, please don't blame yourself.
If it is confirmed you have had a MMC I would suggest asking for the pregnancy to be genetically tested-it has really helped me to see the results and how further development was just impossible in those cases. It gave me closure I feel I wouldn't otherwise have had.
for you