Amy Schumer Arrested with Kavanaugh Protesters in D.C., Takes Immediate Pee Break

[[tmz:video id="0_vgx9iabs"]] 6:30 PM PT -- We got video of Amy while she was being detained, and she got a police escort ... to take a pee. She also says she's remaining hopeful about stopping Kavanaugh's confirmation, and isn't going to stop the fight.…