What happens if my gpa falls slightly under a 2.0 after already being accepted to a university?

im transferring schools and i was accepted in feb to UC with a 2.0 gpa. I tried really hard but i failed my math class and landed me with a 1.8 gpa. Will this give me any problems? can i still go to Uc since ive already been accpeted and all my paperwork turned in?