The past 3 months I've been having a very irregular period. It starts our heavy for a day (with clots) slows to a medium or light flow for a day then stops for anywhere from 24-48 hours then starts up again with a light flow or spotting for a day. I will add in that my fiance and I have been trying to conceive with no luck and I do deal with more than the average amount of stress . What could be causing this all of a sudden??