May be pregnant?

Jeanny
So I'm on the nuvaring and my doctor told me to leave it in 28 days and then put it back in on the 1st of the next month, and since there were only 28 days in February my body didn't have a break so I didn't get my period
It does make me worried though because usually I don't get my period until the 1st of the month and this time nothing happened. Please let me know if this has happened to anyone else or any advice. Thank you, I appreciate it in advance!