I Feel Like I Have A Clot Or Something Stopping

I feel like I have a clot or something stopping my menstral blood flow. I started an intense workout regime about a month ago and have gained significant muscle tone of the buttocks and thighs. Could I have slightly changed the position of my uterus? I'm cramping and bloated but the flow is so light. It ad if there is a blockage. When I do a certain yoga pose the blood does come out.