how long the ring lasts..

[megggy.livejournal.com]

i just realized today that i was supposed to take my ring out yesterday..but now that i think about it i dont really feel like having a period right now, so i kinda want to skip it this month. so i know i've seen people say its good for up to 4 weeks instead of the usual 3 you would leave it in, but is it as effective if you leave it in for 4 weeks? Planned parenthood gave me a free one so if its safer for me to just put in a new one i dont really mind doing it.

thanks!