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It is very early to say for pregnancy.pregnancy can be confirmed by urine pregnancy test after 7th day of missing cycle.
White discharge after 5th day of unprotected sex suggest infection(bacterial,fungal).You have to take proper local care.Use medicated soap to clean.Avoid unprotected sex,avoid sex till get complete cure.
Start complete course of oral antibiotic like cefixime,oflox/ornidazole
and anti fungal like fluconazole-150.
Tinidazole/miconazole/neomycin vaginal tablet will be helpful.
cream/gel will be helpful.
If not improved with first line of treatment than go for investigations like CBC,RBS,PAP smear
Consult your gynecologist for better medical management.