What's to be mindful with your thoughts and feelings? It's not to act out on them every moment in your life. It's to know what you're thinking and feeling are emotions and merely a moment in life. Notice the goodness in this current moment and feel grateful for your life. Every moment is precious, a gift and a moment, yes even periods and discharges. Things that do seem gross or icky aren't in fact that, it's YOU who have chosen to see it that way. Stop seeing it that way, and look at it the other way or don't even look at it. I'm today starting my period and have been cramping like hell last night, and have had a restless night. But I know that my cramps are over currently, and I'm at present enjoying my pain-free period. It isn't that bad actually compared to what males have to suffer. Combine mindfulness with DBT and CBT and you'll be fine with everything in life too. Take it easy!