Above clinical features are mostly suggestive of vaginal yeast infection. Here, you need to take anti fungal cream or vaginal suppository at bed time to get relief.
Next thing, you would undergo one home pregnancy
test soon after missed your period. Blood test
for beta hcg
is required after 7 days to confirm.
Consult with gynecologist regarding this for suggestive measures. Maintain genital hygiene before & after each sexual activity.
All the best.