Nuvaring removal and pregnancy

Given the data you provided, like your LMP (last menstrual period), which was on 16th October, the fact that you are on a contraceptive pill thus having a regular menstrual cycle, you should have gotten your period by now (that is on 13th November), or 1-2 days, latest.

Contraceptive efficacy is not reduced if the ring is removed or accidentally expelled and is left outside of the vagina for less than three hours. If the ring has been out of the vagina for more than 3 continuous hours, contraceptive efficacy may be reduced and a backup method of contraception must be used until the ring has been used continuously for a subsequent seven days. The best back-up method is a barrier one (like condom with a thin layer of spermicides, for example).

But since on Monday you were just 3-4 days away of having your next period, it might not be necessary to take the above precaution nor to take post-coital contraceptive pill (plan B pill).

If you got your period on 13th November, than your fertile days (during ovulation, when you can conceive) were minus 14 days, and that is 30th October, plus/minus 2-3 days, that is from 27th Oct-2nd Nov, which is away from Nov, 10th-11th.

However, you might consider taking a pregnancy test if your menstrual bleeding is 5-7 days late from the expected date.