Kyleena Effective Immediately?

Katia

It’s currently the 7th day of my menstrual cycle and I just got Kyleena inserted this morning. This is the day I would usually start my next pill pack. Everything I read online says if you get Kyleena w/in the first 7 days of your menstrual cycle it’s effective immediately, but my doctor told me to use a backup method. Is the IUD not effective right now? I don’t want to have to use a condom on Valentines Day :/