Go ahead and send a nudge if this is an unusally long response time for them. (check their guidelines, or look them up on duotrope.com for response times)
I gave a nudge email on a story I submitted to a podcast (it's horror). The editor emailed me back the next day, said he originally misplaced my story, but that morning he read it, loved it, and bought it. So a nudge is not an auto-no.