i'm probably hurting myself

I started the mc 3 days ago, or I TRIED to start it. I caved the first night and I ate. I caved the second night and I ate. It was 6pm when I caved today. This is probably really bad for my body, right? I am pre-menstral (I accidently started the fast without realizing it was near that time of the month- however this is a good week for me to do the mc because my husband is doing it, and the woman I share an office with at work is out all week) , I convinced myself that I had stronger cravings for food because of being prementsral, and then I caved in. I regret it now.
I want to begin again tommorow - I know it's only hard the first few days, right? I just need to make it through.
I just needed to reach out, and would appreciate any advice one might have.
:(
Miacka