cloudy urine - what's up with that?

I have been taking MSM for the past few weeks. I started at 1/8 tsp. and am up to 1/2 tsp. Here are some of the effects I believe to be associated with taking it:
- occasional cloudy urine - not every time I urinate, but once almost every day
- in the first couple of weeks, but not anymore, I had headaches in the back of my head/neck that felt a bit different from other tension headaches I've had in that area.

I associate yellow/green urine with the vitamins I take, but I don't know what to make of this cloudy urine. Actually taking a sample to a lab would be a real annoyance, and I'm not sure it's worthwhile. I'm a basically healthy woman...just curious if anyone else has experienced cloudy urine with MSM!