Concerned 😧

So about a week ago me and my boyfriend had sex, and he cummed in me twice for the first time.  (I'm not worried about being pregnant) Evert since then I've had really bad discharge. I have always had a larger amount of discharge every month. So I thought it was that. But now it's green. (I've had yeast infections before, and they never turned green and itched like this before.) Does anyone know what this could be?