A little back story first

I have been put back on the pill after a year’s break by my doctor because of low oestrogen levels and my body’s inability to have a period on it’s own (i didn’t have periods for a year despite being on the pill prior to this and having withdrawal bleeds as normal)

However, for the past 3 months, I have been getting my period whilst still having 4/5 pills left in my pill packet

I can’t find anything online about this so I hope there’s someone here that can help me!!

I’m on the combined pill if that makes any difference

Thanks!!