Hi Leasha,
OMG, could have written this post myself yesterday.

After a very cloudy urine sample yesterday morning (for opk) i was a bit worried too.

You are normal, after much research and a phone call to a Pharmasist friend i found out that yes it could be the vitamins, yes it can go cloudy around o (like in my case) yes it can be a sign of infection but also it can be caused by not drinking enough water.

I wouldnt worry too much about it unless you notice other signs of infection like smells, itchyness or discharge.

Good luck with your IUI this time around