Girlfriend and I have been getting odd hives for weeks

As title says, we've checked for bed bugs, she's gone to an allergist and all they can confirm is urticaria from bugs. Up until now we've not seen any bug anywhere on us. She's convinced it's from kittens we just adopted that did have fleas when we found them on the street.

Today i found a bug crawling on me, what is this little boy?

I've trapped it in an amber vial for now