white vaginal clumps

I have recently changed birth control & last night, after intercourse, I had white rice-like dry pieces on the outside of my vagina! I have never seen anything like this. There was a lot of them, and I believe they had been pulled out of my vagina during intercourse.
I am very sure it has nothing to do with STDs. I did not think it was an infection because I do not have any of the other symptoms, but what else could it be?

[JJety]

It sounds like either a yeast infection, or dried mucous from the friction.  If you have no other symptoms, then try using lubricant and see if it helps.

[free spirit]

If you have no other symptoms of any kind of infection, I wouldn't worry. When you change bcp's, the new levels/types of hormones will change things.