I am using the nuvaring for the second month. I replaced the ring on exactly the seventh day but probably four hours later than the specified time. I then inserted the new ring and a day later was going to have sex with my boyfriend . His penis rubbed up against my vagina for maybe 20 seconds and it was dry. Could the time frame of four hours make the birth control not work? We then had sex with a condom. Is there anything I should be worried about?