Withdrawal period?

I just finished my pack of Seasonique yesterday. I’ve been spotting on and off the last two to three weeks even though I was taking my pill. Has anyone experienced something similar? I’m wondering how long this will last and maybe advice on when to see a dr? How long after withdrawal bleeding did you get your regular period? When I got on Seasonique I had a period for two months straight and I’ve spotted numerous times over the last 8 years while taking this pill.