Dear Postal,
I can offer this opinion. The white discharge is most likely a combination of yours and your husband's ejaculation fluids. Even the next day, these fluids can still seep out. As far as that goes, I would not worry.
As far as the burning sensation goes, that can all depend on what happened when you had sex. If you had rigorous sex, somewhat more rough than normal, that may cause the burning. Not knowing where the burning is exactly, it is hard to pinpoint exactly what is causing the feeling. If you have never had the burning feeling before and you had normal sex (what is normal to you and your husband), then I would suggest visiting your gynocologist for a more in depth, accurate answer. Your burning sensation could be a sexually transmitted disease like chlamydia or gonorrhea (these diseases can occur even between two monogomous people).
You can take a look at this web site for more info if you'd like: http://women.webmd.com/tc/Vaginal-Problems-Topic-Overview.
Take care, and I hope you feel better soon!