Thank you very much for your question. It is our pleasure to answer it.

In the name of Allah, We praise Him, seek His help and ask for His forgiveness. Whoever Allah guides none can misguide, and whoever He allows to fall astray, none can guide them aright.

Dear sister, you should know that vaginal discharge does not necessitate ghusl, no problems here. You must have yaqin (certainty) or at least a very strong presumption that you have had a wet dream (which includes an orgasm). 

And Allah knows best.