After stopping the Nuvaring

Patient: My girlfriend had been using the NuvaRing for a few months. She stopped using it about a month ago, and lately she has experienced strange symptoms. Her period is late and her nipples have been sore. Is this a side effect of quitting the NuvaRing?I have my reservations about her being pregnant, as whenever we have sex, we always use a condom and I pull out.

Doctor: