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Hi, It's Dr. C. Board certified Ob-gyne. I can help you today.
I'm sorry to hear about the swelling. It's hard to say what is going on. It's possible an early sign of pregnancy but it's not certainly something we'd think of right away. More likely would be some kind of allergic reaction to a new lubricant or a flare of a low grade yeast infection.
I wonder if you're having any additional symptoms such as discharge, itching, burning....
If there are no other additional symptoms and it's the first time this has happened, we'd advise to just seek comfort measures for now and see if it goes away on it's own. Comfort measures would be to apply ice packs, baking soda paste, cold plain yogurt, take ibuprofen and perhaps benadryl if allergic reaction is suspected.
Please reply if I can clarify anything or add details. I want to be sure you have the most helpful information for your situation.