Not necessarily. Lack of lubrication on arousal has several causes:
1. Hormonal imbalance - usually eostrogen related (this can be a side effect of taking the pill).
2. Less than adequate stimulation for arousal
3. Nervousness or emotional fears relating to sex
4. Side effects from other medications or medical conditions.
Generally, with infection lubrication tends to become increased and rather feral as opposed to disappearing. My best guess (if it is you that we are talking about) is side effect to the pill - it does the same thing for me.
Some light reading for you:
Vaginal Dryness - Causes and natural relief