Metformin delaying period

so I was taking metformin 500 mg twice a day for about 2 months honestly sometimes I would forget to take it altogether or only take 500mg daily because it made me feel really bad sometimes. Anyways while On it my period got a smidge more regular but not really. I stopped taking it a little more than a month ago and now Im 4 days late according to the app. My question is has anyone stopped taking metformin and not gotten a period,positive pregnancy test, or significantly delayed period? I just don’t want to see another negative test honestly.. thanks ❣️