"Rach... What's going on?" He looks at her worriedly when he notices how red her eyes are.

Then she drops the bomb on him. And all he can suddenly think about how is he doesn't remember using a condom with her (how could he have been so stupid)...

"Are you... are you sure?" If she hasn't had a test yet, maybe it's just a false alarm. Maybe there isn't a chance he hasn't just knocked up his best friend.