Can you get e.coli from eating a spoiled hamburger?

hi, monday i was eating a hamburger that was just unthawed and cooked well, and in the middle of eating i found a little chunk of ground beef that was green, i dont know if it was mold or not but im deadly afraid of vomiting and i want to make sure i wont get e.coli from eating that, i only ate half of the hamburger and i threw out the rest