Missed a few doses of metformin?

Jasmine
Ok so I'm really rubbish at remembering my tablets everyday so the past two months I have missed a few doses. Last month it still kept my cycle at 31 days and everything was normal however I'm now on day 34 of this cycle and there's no sign of af at all. Normally I get achy and have sore breasts and cramps for about a week before af is due but I've had nothing this month. 
I was basically just wondering if anyone on metformin knows if this is normal after missing some days? And if so when can I expect it to go back to normal? I haven't missed a dose for the past ten days.

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