Vaginal itching &burning after sex for 2 days then went away on its own. Do I still need to be checked for std, yeast bv? Or becuz I wasn't very wet?

Itching& lubrication. If intercourse was performed with inadequate lubrication, itching and burning will result due to abrasion of sensitive vulvar and vaginal tissues. If adding a water soluble lubricant like K-Y does not solve the problem, see a GYN and be evaluated for a yeast infection.