I Know The Same Q Over And Over... But?

I am getting married in september my dress is blush pink and I am very fair skinned however I can tan so for about two weeks I have been going to the tanning bed 3 times a week for ten mins each I wear sunscreen (spf10) bcus I do not want to burn and so far I havent. I have developed a slight tan everywhere but my legs they just seem to not tan so I am wondering has this happened to anyone any good tips or products to use. Please let me kno. Lc