Longer Period on Metformin?

This is my first period since starting Metformin 500mg(twice a day) and my period before was pretty normal. Every 28 days for 3-4 days long, normal bleeding. My period after starting Metformin lasted 10 days and was a little heavier. Has anyone else experienced this? I was also taking 1900mg of Maca Root once a day. Don’t know if this makes a difference. Hopefully it’s a good thing, as I’m TTC🙏🏽