Switching Birth control

Rachelle

Hey y’all!! So I have been taking Aviane bc pill for almost a year now and my doctor recently switched me to a lower dosage called Lo Loestrin Fe to try to help with the nausea and headaches I was having daily. I’m on my 3rd week of my current (aviane) pack and I’m unsure when I start the new pack. Do I start it when my period starts or on the day I would of started my next pack?