On nuvaring for 3 months, the first two months I kept it in 4 weeks at a time so I never got a period. My period before was the 21St of every month. I inserted my 3rd dose 2 days late on the 23rd. The following month I had unprotected sex on the 8th, the nuvaring fell out and I never put it back in, we also had sex the 9th. It's is now the 12th and still no period. Will it return the 21St? Could I be pregnant?