Have you tried drinking one of those citrus powder drinks (Ural sathchels)mixed in water will stop the burning when passing urine. Wash out the affected area gently and thoroughly in cool non-soapy water and pat dry well. Swim in the salt water if you live near the coast. Don't wear undies under skirts and dry cool air will upset the bacteria. Don't wear nylon knickers - the bacteria loves it. Be as close to nature as you are in your very natural state of pregnancy. Hope everything goes well for you. Stay cool. Remember the famous Marilyn Monroe photo - you could try that.